This effect is known as bullet drop, and its basically a measurement of how much the bullet deviates downward from a straight line to the target. Do you have a 300 BLK that hammers (say, five 5 shot groups under 1 MOA in a row)? password, Sub Category: The only prep work I did before loading was sizing the cases, tumbling them and chamfering their necks. Trouble with RCBS 300 Blackout Dies Not Seating Bullets Consistently March 31, 2021 If you're having trouble with RCBS or Hornady 300 blackout dies not seating bullets consistently, this should help. If it's not feeding the next round you might try a lighter weight buffer or a different magazine or different type of magazine with a different spring rate. They offer an almost identical practice cartridge that uses the same amount of gunpowder, but with a full metal jacketed bullet instead of their Machined Selous Expander bullet, which drops the price to a more affordable 98 cents per round. Not the best for accuracy. . Most barrel makers and benchrest shooters will tell you the best accuracy for a given bullet is obtained with a twist rate that just stabilizes the bullet. The 300 Blackout has become one of the most popular rifle cartridges available. While different brands, weights, and loads of ammo will have slightly more or less muzzle energy than this chart shows, it gives you a good ballpark estimate for most off-the-shelf 5.56 and 300 Blackout ammo. without overly sacrificing bullet performance and lethality . Thanks for the help. More bullet energy on target = more potential killing power. It is absolutely true that supersonic .300 Blackout is every bit as effective as other intermediate rifle cartridges such as 5.56mm or 7.62x39mm. Some people question whether or not the 300 Blackout is effective for killing deer, and the simple answer is, yesabsolutely. Youll need to practice with the right optic, but with training you could learn to hit a man-sized target on your first shot at that range. Magtech Full Metal Jacket Subsonic 200-grain 300 Blackout, Magtech Full Metal Jacket Supersonic 123-grain 300 Blackout. The set-out problem is caused by inadequate neck tension and trying to taper-crimp cases that are not all exactly the same length. Some say you want to use the fastest, flattest-shooting bullets you can find. The latest content straight to your inbox plus an automatic entry to each of our monthly giveaways! I spent several hours chambering dummy cartridges with a variety of bullets and measuring set-out, and in fact, I found it occurred to some extent with every bullet tested. I am using a can. Specifications: Length: 3.8" Width: 2.1" Height: 2.5" Weight: 9.0 oz Water Resistant: Submersible to 10 ft. Mount: 1" Weaver or MIL-STD-1913 rail Power Source: One 123 lithium battery For now, lets focus on subsonic ammo. Also guessing that you've already checked that your gas block is properly lined up with the port; opening up the port would be my last resort unless it's one of the barrels known for having small ports to begin with (have to search around the net, don't remember which they were but there was some discussion of them a while back). Is the 300 Blackout just a new knickknack for tearing up targets at the range, or is it the better mousetrap weve been promised? I have experienced light strikes on Remington Match ammo on numerous occasions. 0. JavaScript is disabled. So, the final word on the 300 Blackout is that if you want to use a suppressor and subsonic ammo to fire the most powerful quiet bullet possible . Its more powerful, efficient, and lethal when fired out of short-barreled rifles than 5.56 ammo. I am using reloaded ammo (220 gr jacketed) and have shot thru a chronograph at about 1050 fps. Frangible bullets are a little different. Its hard to find a cartridge that does this better than the Discreet Ballistics Selous Machined Expander you just learned about. If you do decide to join the dark side and try 300 Blackout, make sure you come back here and let me know what you think of it! Imagine that your cars engine has died and you need to push it down the road. Even worse is when a combine that harvests grain needs a part only made in China. On the plus side, though, it can also hold a heavier, wider bullet than the 5.56 and still work in an AR-15. There are five main reasons people use 300 Blackout ammo over 5.56 and other similar rifle cartridges: Lets cover each of these points briefly. The Glock 17L has a 6-inch barrel25% longer than the Glock 17but only produces muzzle velocities of about 1,280 fps, or 10% greater than its shorter-barreled little brother. (Have any suggestions for ammo that should be on this list? The 300 AAC Blackout was designed to achieve energies similar to the 7.6239mm Soviet in an AR-15 while using standard AR magazines at their full capacity. Jason Imhoff then drafted the specifications for the cartridge that would eventually be approved by SAAMI. The Hornady Full Metal Jacket Frontier 300 Blackout ammo is their value target practice cartridge, but since its Hornady its more than good enough for classes and competition. However, we show the problem and some testing. 10 mph wind coming at a right angle from the side of the shooter, 0.3 ballistics coefficient (about average for 300 Blackout). If you also know a bullets ballistics coefficient, you can then use a ballistics calculator to estimate how much energy the bullet loses along its path to the target. All Rights Reserved, Botswana Safari with No Second Place Winner Bill Jordan (Part 2). Now, to calculate a bullets energy on target, you need a few pieces of data: Bullets have the most energy right after they exit the muzzle of the gun, and this number is referred to as a bullets muzzle energy. So if you enjoyed this, would you share it on Facebook and Twitter? The second a bullet leaves the muzzle of a gun, gravity begins pulling it toward the ground. The recovered diameter (RD) was measured in inches across the face of the bullet in two spots and represents the average of those two measurements. You must have JavaScript enabled in your browser to use this website. All in all, its probably a better cartridge for killing deer than 5.56, so not only is it legal its also preferable. Reloading 101: Measuring group size and converting to MOA, Remington 700 SPS 243 Win to 6 Creedmoor conversion: Budget precision rifle, Designed to bridge the gap between 308 Winchester/7.62 NATO and 50 BMG, the 338 Lapua Magnum (8.670) has developed an impressivefollowing with long range shooters. All AR-15 uppers are standardized to work with AR-15 lowers, so you know that the two parts will always match, too. I tried taking one of the weights out of a carbine buffer, and it moved ejection from 5 to 3 o-clock, but it still wouldn't pick up the next round. The barrel is chambered in 300 AAC Blackout with a 1 in 8" twist. I have a Seekins Lower & Upper, NOVESKE 14.5" Barrel, KAC URX 3.1 13.5" rail, Spikes Tactical 5.56 BCG, Spikes Tactical Milspec Buffer Tube Kit, and PRI Gasbuster Charging Handle. The only downside of these cartridges is the cost$1.8 per roundwhich makes it expensive to practice with this ammo. Solution for 300 AAC Blackout jamming! 300 blackout uses very fast pistol powders and the pressure spikes optimum for cycling happens early. With some loadsparticularly those using the 125-grain Nosler AccuBond and 150-grain Nosler Ballistic Tipthe bullet would migrate forward in the case when the cartridge entered the chamber. For example, I have an AR-15 upper that fires 5.4539, but I have to be careful which magazines I use as some of them simply wont feed this Russian ammo properly. Even with vertical stringing apparenta result of the supersonic/subsonic velocity mixthe 190-grain VLD load was more accurate than any of the subsonic factory loads I tested. The barrel is 16" with a mid length. You can see the similarity of the case sizes in a picture like this: The cartridge on the left is the 5.56, the one in the middle is the 300 Blackout, and the one on the right is the 7.6239. (Not important in my opinion, but worth knowing if youre concerned about the government keeping tabs on your arsenal). Many states dont allow hunting deer or any other large game with 5.56 or other similar bullets like .223 Remington, although the details are confusing. I'm a huge fan of the 300 Blackout round. In other words, the drop of 5.56 bullets is about half as much at any given range as supersonic 300 Blackout bullets. If so, that's your problem. You can reliably hit man-sized targets at 300 yards with supersonic 300 Blackout ammo or 150 yards with subsonic 300 Blackout ammo. if you use bullets that are designed to expand while moving at subsonic speeds. As an added bonus, its all-copper construction means you dont have to worry about picking slivers of lead out of your steaks. For example, if you level your rifle at a target 100 yards away and fire, and the bullet hits 3 inches below where you aimed, then there were 3 inches of bullet drop. At 400 yards, though, the bullet has dropped almost 5 feet. Next, I tested terminal performance by firing each load into blocks of 10-percent ordnance gelatin. Copyright 1996-2023 AR15.COM LLC. In the gel, it acted like a high-velocity pistol bullet, which it isSpeer designed it for the .30 Carbine cartridge. . The 300 Blackout is a rifle cartridge thats more powerful than the 5.56 when fired out of a barrel thats less than 16 inches long. So while some of us have chased after .300 BLK for its usefulness in hunting medium-size game, potentially defense, or even for the recreational enjoyment of the round, its safe to say that we will all experience more pleasurable range time with a dedicated .300 BLK magazine for our .300 BLK firearms. After testing 11 currently available .300 AAC Blackout factory loads, I came to a couple conclusions. Post This is why theyve become popular for home defensetheres no risk of overpenetration. When seconds count and the police are minutes away. Forum member @Mr.Brooklyn asks the following in his profile post: "Has anyone else been having problems with the Springfield Saint Victor 300 Blackout jamming?I just purchased this firearm brand new and immediately I began having these issues my first time shooting it." I decided to post his question as a forum thread (I hope you don't mind Mr.Brooklyn), as I just also recently purchased the . It's probably just the block shifted out of place. Instead of being made of solid lead and copper, like most bullets, frangible bullets are made of a mixture of compressed metal powders. While the cross-compatibility of our .300 BLK and 5.56 NATO rifles is highly desirable, it could be a potential risk if we do not check ourselves and make sure we are putting the right rounds into the right firearm. by jFlacoS Sun Dec 29, 2013 10:42 am, Post That way, you can practice on the cheap while maintaining your skill with home defense cartridges. All Rights Reserved. Any 300 Blackout upper should run on any milspec 5.56 lower without modification. Its base, capped with a bit of lead core, penetrated to approximately 15 inches but was only about the size of an aspirin. Thats not a bad tradeoff when you consider the terminal ballistics of 300 Blackout vs 5.56 (which youll learn next). As a result, you generally want your home defense ammo to . The copper base of the bullet is weakened in key spots so that when its forced to expand by the aluminum nose of the bullet, it flies apart into several sharp copper shards. It cycles supersonics fine, it cycles the subs with a borrowed suppressor just fine, but it's not getting enough gas to run subs with no can. *Must have a registered ARFCOM account to win. Worth the price if your lifes on the line, though. Whats the Ideal Barrel Length for a 300 Blackout Rifle? . AR15.COM is the world's largest firearm community and is a gathering place for firearm enthusiasts of all types. 7.62x39mm is a respectable cartridge and so is .300 Blackout when it is loaded to supersonic velocity. The 300 Blackout, on the other hand, is designed to reach maximum muzzle energy when fired through a 9-inch barrel. If you plug these stats into a ballistics calculator, like this one, then you can estimate how much energy each bullet will have at different distances: 300 Blackout vs. 5.56 Bullet Energy (ftlbf). [ARCHIVED THREAD] - .300 Blackout pistol failure to feed issues. I have tried a lighter spring and heavy lubrication with no success. Spikes likes to use "HeavY" buffers in their kits for .223, 300 BlkOut Issues: Failure to Feed, Double Feeds, Stuck Ammo, http://www.youtube.com/watch?v=iVzCQ0LL2A8, Re: 300 BlkOut Issues: Failure to Feed, Double Feeds, Stuck. While neither are well suited for long range shooting, they are more than adequate at close to medium range. You gain a .30 caliber cartridge that can be fired from a traditional 5.56 NATO/.223 lower receiver (Whats the difference between 5.56 and .223? Another common problem with subsonic 5.56 ammo is that it often doesnt have enough energy to reliably work in semi-automatic rifles, like the AR-15. To be honest I will probably shoot the gun suppressed 90% of the time anyway. Terminal performance was excellent. I have a CMMG 8.5" barrel. We dive deep into the best of the .300 Blackout. The rifle, as pictured above, includes the following parts fromBrownells: It took 26 different loads to get it end up with both a super and subsonic load around a MOA. The idea behind the .300 Blackout was to try to fix all these problems while retaining the format. With a 16" barrel and mid length gas system it 'should' be able to cycle using subsonic ammo even without a can. The 300 Blackout is a rifle cartridge thats more powerful than 5.56/.223 (AR-15 ammo) when fired out of a barrel thats less than 16 inches long and works reliably with both super- and subsonic ammo. Youll often hear people say that the ideal barrel for shooting 300 Blackout is 8 or 9 inches. Discussion about rifles in 300 AAC BLACKOUT (7.62x35mm), hosted by the creator of the cartridge. The 1911 is an iconic design, and the 2011 takes it one step further. The cartridge, primarily intended for hunting, offers a greater case capacity and comes with a 1:12 twist (so you cant stabilize the heavies). (L to R) 5.56 NATO, .300 BLK, .30 Carbine. It penetrated as deep as any of the lead-core bullets loaded in the factory loads I tested. And others say any halfway decent hollow point will do. PRESCRIPTION 2Bullet: 110-grain Speer Deep Curl RNPowder/Charge: Hodgdon Lil'Gun, 19.3 grainsPrimer: Federal Small RifleCartridge Overall Length: 1.77 inchesMuzzle Velocity: 2,401 fps. WARNING: Technical data and information contained herein are intended to provide information based upon the limited experience of individuals under specific conditions and circumstances. Itll reliably kill deer, hogs, and people within those ranges, too. PRESCRIPTION 3Bullet: 125-grain Nosler AccuBondPowder/Charge: Accurate 5744, 20.8 grains (compressed)Primer: Federal Small RifleCartridge Overall Length: 2.13 inchesMuzzle Velocity: 2,203 fps. When youre looking for plinking and practice ammo, a good rule of thumb is to look for the absolute cheapest ammo possible, and then go with whatever is slightly more expensive than that. You have to step up to the true heavyweights to get below the speed of sound. Revisiting the Suppressed .300 Blackout for Survival. Product prices mentioned in articles and videos are current as of the date of publication. Neck tension can vary between pieces of brass. If you like Rifleshooter.com, please follow us on Facebook. Now if only theyd chamber it in a lever action rifle! Keep in mind, that its wildcat predecessors like the .300-221 were known to be fairly accurate with the right twist rate. It should be equally or more powerful than the 7.6239 cartridge (AK-47 ammo) when fired from 9-inch barrel. Known for its ability to deliver heavy subsonic bullets for standard AR magazines while cycling the action in suppressed applications, [], Ive done a few Special Purpose Rifle (SPR) builds over the years and was always happy with the results. CONS: A little short in the stock and I'm no fan of super soft recoil pads. Check the Price. Andrew Betts served with the Arizona National Guard for over 12 years, including a tour to Afghanistan. Best results are found with bullets between 110 and 125 grains. I will try some other loads and see if I can keep sub and still cycle. I first tried opening gas port, still wasn't perfect, switched to vihtavouri 530 powder, and works great. So, instead of continuing to beat this horse, lets look at how the 300 Blackout compares to the 5.56 in terms of muzzle energy. That means if you aim at someones chest at that range, the bullet is most likely going to slump into the ground at their toes. Set-out was a noticeable problem only with the Nosler bullets, but it could have been occurring with other bullets, too, and just not showing up as glaringly on target. Before we go any further, its worth spending just a moment to get acquainted with the 5.56, as well be comparing it to the 300 Blackout throughout this article. The casethe brass part of the cartridge that holds the gunpowderof the 300 Blackout is the exact same width as the 5.5645 at the bottom, but is considerably wider toward the top of the case where the bullet is held. Their higher B.C. Theres one key difference between hunting ammo and home defense ammo. I'm having a similar issue with a friends blackout pistol. In supersonic loads, 150-grain bullets are on the heavy side for the .300 Blackout. Not only do hollow points create much larger holes, they also cause the bullet to slow down much faster after entering the target, reducing the chances that itll pop out the other side. Its deadlier than 5.56 and 9mm when fired out of short-barrels. Lets consider the Blackout with 150-grain bullets at 2,100 fps. Not only does subsonic ammunition perform far more poorly in tissue, it also gives up one of the other primary advantages of a rifle: the ability to penetrate soft body armor. If your barrel isn't dimpled correctly for the block screws that might also be the culprit. If you are looking for an easy to tune, high accuracy round, you may be better served elsewhere. This significantly bumps up the muzzle energy without exceeding the speed of sound. The car begins to move, and at this point you could stop pushing and let it coast forward a few feet. bullet all the way up to 220 grains. The first thing you need to know about 300 Blackout external ballistics, is that this cartridge wasnt designed to shoot over long ranges. P.S. As deer ammo goes, that's slow, but only 200 fps slower than the old 30-30. I have heard you only want to convert brass from the US to 300 Blackout brass. It works well with supersonic ammo. 300 Blackout ammo in this price range will typically have brass cases (which are more reliable and cause less wear and tear on your gun than steel), full metal jacketed bullets, higher quality primers, and gunpowder thats less corrosive, extending the life of your firearm. The Definitive Guide to 6.5 Creedmoor vs. .308, The Second Amendment Manifesto: What Every American Should Know about Their Constitutional Right to Own Guns, 300 Blackout Ammo Is More Powerful, Efficient, and Lethal When Fired out of Short-Barreled Rifles Than 5.56 Ammo, 300 Blackout Ammo Is More Powerful Than 5.56 Ammo When Shooting Subsonic (Quiet) Bullets, 300 Blackout Ammo Is Legal and Effective for Killing Deer, 300 Blackout Ammo Can Penetrate through More Material (Walls, Trees, People . I rounded up a variety of bullets I suspected would offer terminal performance not available from factory supersonic ammo, and then went to work at the loading press. I have used multiple mags with no success. We have to pick a number, though, so lets run with the Hornady Sub-X Subsonic 190-grain bullets, which have a ballistics coefficient of 0.437which is probably close to the average for subsonic 300 Blackout bullets. Theyre designed to lock onto the gun and then push fresh cartridges into the inside of the gun so they can be chambered and fired. In most cases this means nothing. Well, someone did. Granted, not all obstacles are going to be soft pinewood, but this does illustrate just how much more effective the 300 Blackout is at penetration than the 5.56. Beyond the upgrade in bullet diameter, the 300 BLK offers the versatility of heavy 220 grain plus subsonic projectiles as well as lighter supersonic offerings. Let me know in the comments section below! The bullet expanded the widest of any I tested and pushed to 15 inches, where it exited the bottom of the block. Then show it finally being reso. It was the fastest handload I tested. Magazines, often incorrectly referred to as clips, are spring-loaded metal or plastic containers that hold ammunition. So, why not just use hollow point 5.56 ammo? My problem is that once you drop the bullet weight to gain enough powder to make the 300 Blackout supersonic/high-velocity so that it will actually cycle in your average AR-15, you gain nothing over the .223 round. Both average 1000-1050 fps. Like the same mid-length gas that's on a 5.56/223 rifle? There's a narrow band of powders that work well with the .300 Blackout. Frankenstein AR-15 troubleshooting question, .300 Blackout/Whisper Ballistics Gel Results, retrieve your Drag also affects the bullets trajectory, which can have a significant impact on accuracy even at close ranges. Failure to Launch? As you learned a moment ago, the 300 Blackout has significantly more muzzle energy when fired through short barrels than the 5.56. Others say you should use the heaviest, most powerful ammo you can find. Copyright 2023 National Rifle Association, Women On Target Instructional Shooting Clinics, Volunteer At The Great American Outdoor Show, Marion P. Hammer Women Of Distinction Award, Women's Wildlife Management / Conservation Scholarship, National Youth Shooting Sports Cooperative Program, 11 currently available .300 AAC Blackout factory loads, SilencerCo Launches Harvester Subsonic Ammunition Line, HPR Introduces the New .300 AAC Blackout in 110-Grain Barnes TTSX Configuration, Ruger Mini-14 Tactical Rifle Now Available in 300 AAC Blackout, Lessons Learned From a Ballistician | An Official Journal Of The NRA, New: Fiocchi 5.7x28 mm Subsonic Ammunition | An NRA Shooting Sports Journal, New: Browning Ammunition SUB22 Subsonic Rimfire | An NRA Shooting Sports Journal, Feeding The Ishy Low-Pressure 7.62 mm NATO For Indias Enfield | An NRA Shooting Sports Journal, First Look: Mission First Tactical Multi Mount, Is It Right For You? Two reasons, case capacity and barrel twist. The Blackout with a 220- or 225-grain bullet can be driven at least 1,000 fps from a 16" barrel to give about 488 foot pounds of energy at the muzzle. Its so bad in this regard that it often doesnt penetrate as well as 9mm ammo. It may only be me, butwhen I do encounter a 300 BLK that shoots, its often not a true 300 BLK. TNVC/NGI Giveaway: 15 winners with over $7000 worth of prizes!! Although .30 Rem. You see where this is going, dont you? Did you say 16" barrel with a midlength gas system? Born in the early 2010s when a few unnamed military special operators needed a specialized close-combat round, the .300 AAC Blackout is no passing fad -- the BLK has become one of the most popular AR cartridges around. With the 210-grain Berger VLD Target handload, four of the 10 rounds were above the speed of sound even after reducing the powder charge. The 300 Blackout is one of the most powerful, versatile, and lethal kinds of ammo you can fire out of a short-barreled AR-15, and with subsonic ammo, its extraordinarily quiet when fired through a rifle with a suppressor. So in the case of home defense ammo, you want your bullets to cause as much damage as possible to the target without careening out the other side. Its literally how much bang you get for your buck. This is certainly the prominent selling point of the cartridge, but one of the areas the 300 BLK will sometimes lack is accuracy. Specifically, you want to know how much energy a bullet has when it hits the target, which is referred to as a bullets energy on target. After a number or trips to the range and a lot of brass and bullets, I found a load that would work- note the bughole in the middle left side of the target below. There are many different theories on what makes the best hunting ammo. Weakening key points along the length of the ogive so that slivers of the bullet poke out at angles designed to cause maximum trauma inside the target. Subsonic ammo is lower-powered ammo that only propels bullets to just below the speed of sound. As youll learn later in this article, while this does make rifles much easier to use in confined spaces, it also neuters the power of the 5.56 cartridge. You can easily adjust for the 8 inches of drop at 200 yards by aiming slightly above the target. (Just make sure you dont accidentally shoot 300 Blackout ammo through your 5.56 upper, or this happens.). And to take things a step further, what if you want to hunt animals like deer, hogs, or even elk with 300 Blackout? My personal experience mirrors this. Theres a lot of crossover between home defense ammo and hunting ammo because the intended purpose of both is similar. I also have the problem, that the 300 neck is always 2-3mm to high, so that I need to re-size the trimmed cases again. VERDICT: I reviewed an "American" a few . In the case of hunting ammo, you want your bullet to penetrate deep into the animal and if possible, go completely throughentering one side and flying out the other. I used load data from Hodgdon and Accurate, but my first attempt yielded supersonic velocities. Most bullets move faster than this speed, which is responsible for the loud crack a bullet makes as it travels through the air. But that momentum is just as effective for the hog hunter. Shooters who join the .300 BLK bandwagon may attribute issues they experience in failure-to-feed (FTF) or failure-to-eject (FTE) to their rifle when in fact, they should take a more discerning look at the magazines they are using. Have anything else to share? In the case of home defense, you want to incapacitate the person as quickly as possible, which basically means causing as much damage as possible. When I built mine, I settled on a 22 barrel, [], The 300 AAC Blackout (300 BLK) is a popular alternativecartridgein the AR-15/M16 M4 (AR) community. This presents little problem if you do not already own a 5.56mm rifle, but it seems fair to wager that the majority of prospective .300 Blackout owners also own AR-15 type rifles chambered in 5.56mm. If you are looking for a cartridge that can run with subsonic and supersonic ammunition in your AR, it is a great choice. At my shop I won't sell 300 BLK barrels with carbine length gas systems. The 300 BLK has such a small case you are effectively loading pistol powder into a rifle cartridge. The best way I've found to solve this problem is to size brass without the expander ball in the die. If youre using subsonic bullets, then cut that range in half. than 5.56 ammo. None of the 210-grain VLD handloads cycled the carbine's action. Machining a wide hollow point bullet out of a solid slug of copper (which expands more reliably and holds its shape better than a mixture of lead and copper). Increase the amount of energy the bullet retains. 300 Blackout Ammo Is More Powerful, Efficient, and Lethal When Fired out of Short-Barreled Rifles Than 5.56 Ammo 300 Blackout Ammo Is More Powerful Than 5.56 Ammo When Shooting Subsonic (Quiet) Bullets 300 Blackout Ammo Is Legal and Effective for Killing Deer 300 Blackout Ammo Can Penetrate through More Material (Walls, Trees, People . This additional mass gives the 300 Blackout a lot more momentum to push through obstacles and into your target. Should I take out 2 weights or clip his spring a couple coils? 5.56 can be more lethal than 300 Blackout when fired through a longer barrel, which allows the 5.56 to reach peak muzzle energies. Hence, .30-caliber is about one third of an inch. Summary: When it comes to rifles with barrels less than 16-inches long, though, the 300 Blackout is more lethal than 5.56. In other words, if you were to shoot a 5.56 through a 9-inch barrel, it would have significantly less muzzle energy than the 300 Blackout. My 300 BO will not cycle using subsonic ammo with a can. After a hard weekend at the range running some difficult drills with an 18 pound 300 []. Frank Green at Bartlein barrels uses the example of High Power rifle competitors using stock Colt 1:7 rifles back in the day experiencing 4 MOA results with 55 grain loads, and sub MOA with the same rifle and shooter using the 69 SMK. What's the load data? Heres a fun example of this principle in action: Thats a .50 BMG punching through three cinder blocks, and the reason its able to pull this off is because its an extremely heavy bullet moving very fast.
