And now for the killer..I dumped ALL my 5.56 stuff, all of it including the progressive press set up just for it, and went full in on 300 BLK. The .300 BLK bullets are 0.30 inch in diameter (7.62 mm) and the .223 Rem (5.56 mm) is 0.224 inch. Contact our team at 80 Percent Arms to learn more. Unscrewing a muzzle device and replacing it with a suppressor in the field sucks. This is because the latter is thicker and wider, causing more drag as a projectile. Its not going to be long until you want to suppress it and/or SBR it. .300 Blackout Guide: Best Barrel Length, Build Tips & More. Keep reading to discover the best barrel length for .300 Blackout for different shooting scenarios. Cartridge Overall Length: 2.02 inches. But if the amount of gunpowder to be burned is held constant, the length starts becoming a drawback. A 9" barrel will allow any 300 BLK cartridge to reach optimal velocity, while an 11.5" barrel will provide a bit more accuracy and stability if you plan on shooting mostly supersonic loads. When an object travels faster than the speed of sound and breaks the sound barrier, it generates a sonic boom. A big boom, and a really big flash, sounds like fun, when fun is the goal, anyway. With a warm barrel/suppressor unit, it is possible to shoot impressive groups. Such large projectiles convey a subsonic muzzle velocity that is accompanied by a quiet report. A 30BR pushes from 107 grains to 120 grain 30 cal projectiles. https://en.wikipedia.org/wiki/.300_Whisper. Im not sure if 18 or 20 or 24 would give the absolute greatest velocity, as I havent seen the specs on 300 BLK velocity in a 24 inch barrel. ALL Bulletin content is copyrighted, 2023 AccurateShooter.com. ps.the arm brace apparently was deemed legal by ATF for incidental resting on your shoulder. With a 1-7 twist rate, for instance, it means that the bullet will be spun once over 7 inches of rifling. I get a lot of questions like this and figured that rather than responding to one specific email I should put it out there for other people as well. Hi Lance, well I thought like you did, stick it on and go but being a dumb old guy I did not bother to research much. Mine has a 10. I have a 762-SDN-6 suppressor on a 300 BLK rifle I built with a 16 barrel shooting subsonic 220gr ammo but I dont get the tick, tick, tick when shooting. As for silencers, theres some competition out there. Let your fellow shooters know share this article using the Facebook, Twitter and other social media icons below. Although functionally identical to the 300 Whisper, the 300 AAC Blackout is its own SAAMI standardized cartridge. The odds are good enthusiasts will see diminishing, if any, return for running subsonic cartridges through 18-inch barrels or longer. Reader Pete writes: Hi Nick,I live in Amarillo and really enjoyed your article on your 300 BLK build. Ive only ever seen youtube videos of it. Here is the old barrel length again Longer barrels have been proven to have better velocities and it depends on your burn rate on your powder whether you get the full use of your barrel. My guess is your luck will be like mine. If youre looking for the quietest and best handling setup, you could easily go as short as 7.5, which is offered by makers like Faxon Firearms and others. anyone have a good reliable source for ballistics of the most commonly commercially available and popular 300 blackout roundish relation to barrel length and rifling? All you need is a bigger diameter barrel. What happened was the Sig Brace. It is cross-compatible with. Passing through the sound barrier imparts wobble. Copyright Ammotogo.com 2023 All Rights Reserved. (In the early days of jet aircraft, a lot of planes were shaken apart when passing through the sound barrier.) Most AR-15 upper 300 Blackout rifles feature the 1:7 and 1:8 twist rate, which is the rifle barrels spin rate. Ballistically, the .300 AAC Blackout has almost 17% more energy at 300 meters than the 7.62 x 39 round. WebThe 300 HAMR 1-11.25, 1-13, or 1-15 twist match grade barrels are optimized for accuracy with 95gr to 150gr bullets from 8 to 20 barrel lengths. 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
But barrel length can significantly impact your firearms performance. To counter this, of course, there is always the option of sticking a silencer onto the muzzle. If you want a compact package with acceptable performance out of both supersonic and subsonic loads, then 8-10 is a good compromise. If you're looking for a multi-purpose load for the .300 AAC Blackout, this may be the best bullet. This issue isnt unique to 300 Blackout bullets, though. A more rigid barrel is better. Even better, the .300 Blackout barrel comes in various lengths, allowing you to pick a length that best fits your needs. It also has a great barrel life, which means it can go for long periods and operate effectively under varying conditions. Wondering if you know if theres a significant advantage in range with a 10.5 (both sub and super-sonic). The only thing that barrel length gets you is velocity the longer the bullet is in the barrel and being pushed by the expanding gasses of burning gunpowder, the faster that projectile will be going. Gun Review: Henry U.S. So, I dont know, but its all very interesting to me. It probably worked loose after multiple shots, and somebody forgot to tighten it back up. In short, barrel length arguments or advice are pretty worthless in comparison to having actual mathematical data and testing. Longer barrels are not automatically more accurate. So would a better/different suppressor. The. 300 BLK by AAC: An Introduction by Paul Erhardt. barrel as the majority of common loadings just dont need anything longer. An extra inch wont hurt anything. It happened that way because when the Russians developed the round, all of their 7.62mm barrel making machinery was built to make 1:10 twist barrels for a bazillion Mosin Nagants and a swag of machine guns in 7.62 x 54R. You can either start with a barrel length, or a baseline load. For an apples-to-apples comparison, the Hornady V-Max 110-grain load (also zeroed at 100 yards through 16 inches of barrel) has a muzzle velocity of 2,375 fps. So you recommended the harvester- the same can that BLEW OFF a rifle at TIFF and flew 40 yds into the berm. We are not only talking about powder burn, but the pressure created by the expanding gasses of the powder. They result in less range and more bullet drop at distance. Lastly, a 16-inch barrel provides a long line of sight to improve your aim. On a gun you plan to carry, super heavy barrels are not ideal. When you pair the barrel with .300 Blackout ammo, you get an easy-to-carry gun that spits rounds capable of penetrating heavy barriers. Consider a rifle with a barrel 1000 yds long. 300 Blackout SAAMI Cartridge Specification. Wildcattersgun owners who fabricate and reload cartridges of their own designexperimented for years with a .30-caliber AR-15-friendly version. The main question you need to ask yourself is whether or not you plan on using a suppressor. Here are answers to common questions asked about .300 Blackout barrel length: The length of a .300 Blackout barrel affects accuracy in several ways. The .44 Mag is well known for picking up considerable velocity from a carbine. Will the gun be a 'do it all' for long-range or short-range shots? Heavy, expensive, and absolutely fantastic. WebThe 300-Blackout is a lower-power 30-caliber cartridge. A subsonic 300 Blackout round produces comparatively little muzzle flash in addition to a softer report, making it a fine choice for hunting in nighttime and twilight conditions. said. The .300 Blackout barrel delivers firepower and accuracy comparable to longer barrels. Personally, if I had to do it all over again, I would definitely not go with a 762-SDN-6. And thanks to the mounting system, you can get multiple end caps to thread it on everything from 1/2 x 28 threaded barrels to H&K 3-lug mounts with a few seconds of twisting. Also, you shouldn't trust in Trustpilot. Comparing my 5.56 barrels (18.5, 14.5 and 10.3) is a whole different story. Then you can also pick a slightly faster burning powder to get a complete burn in 16 of barrel. Hunting, home defense, and competition style shooting, the .300 AAC Blackout does it all. This high-speed feature means that the bullet will spend relatively less time in motion and thus less prone to the effects of elements like the wind. The 300 AAC Blackout delivers ballistic performance comparable to 7.6239, yet possesses a base diameter that optimizes functionality in an AR-type platform. Bullet drop is calculable, though, so that should really fall under marksmanship, as opposed to intrinsic accuracy of the rifle? Putting a .308-caliber bullet in a .224-diameter barrel is a recipe for disaster. Your muzzle choice should also be in consideration of the flash produced and the muzzle rise with every shot. 5. In any case, you need to start by fixing a variable (target velocity, barrel length, cartridge) and go from there. If you build an AR pistol, the 300 is the perfect round. Maybe he purchased them for a few hundred dollars prior to 1986 or inherited them from someone who purchased them for a few hundred dollars prior to 1986. One thing is true your bullet accelerates until it either runs out of fuel or leaves the barrel (technically, youll start losing velocity before all the powder burns as a portion of the energy is used to overcome the friction of the barrel itself). Yeah, I lose some velocity for supers in an 8. The .300 Blackout also comes in a supersonic variant, which means once fired, the bullet travels faster than the sound barrier. Advanced Armament Corporation (AAC) started working on the cartridge in 2009 after a U.S. military organization requested the development of a .30-caliber round capable of running in an M4. In large part because of PSAKs being very dangerous garbage until very recently. This may possibly be true, but I dont see links to formally derived stats to back up this claim. Visit us today to browse the .300 Blackout barrel lengths. FBI: Crime Rate Dropped During 2013, Year of Record Gun Sales. Our initial research data covered the relationship between barrel length and velocity for some 13 common handgun calibers/cartridges. Either way you go it is cheaper and requires the least modifications-while providing far superior performance and effectiveness over 5.56 in certain scenarios. Its the pressure of expanding gas behind the bullet that accelerates it, and it doesnt fall off at 9. Have been shooting 300 for a few years now. Any length over that will actually result in lower velocities. The SAAMI diagram for the 300 BLK is shown below. It is extremely easy to convert an AR-15 to fire 300 Blackout ammunition, and the rounds ballistic performance is different enough to justify purchasing the barrel necessary to do so. A 6-inch .300 Blackout barrel is short enough to carry as a concealed weapon, and drawing and aiming the reasonably sized weapon is hassle-free. The SAAMI diagram for the 300 BLK is shown below. The accuracy of a .300 Blackout barrel will depend on the exact round and barrel length you use. So many thanks for your article and any advice you can give. For varmint hunters, competitors and gun owners practicing at distance, supersonic .300 BLKs are big medicine. The reduced recoil and muzzle rise make taking accurate follow-up shots much easier. It will be NINE inches in length. A fast attach lets me do that. I have a Q Honey Badger Barrel Assembly which is 7 and a Q Trash Panda. I avoid max loads to increase case life, so speed isnt as important as how accurate the load will shooot. Be first to know about promotions and new product launches. Affordable Factory 300 BLK Ammo is Available. The best barrel length for .300 Blackout depends on how you intend on using your gun. In instances where that is not an option, however, you can always go long or brace yourself for those loud blasts with every shot. QA/QD systems may add more tolerance stacking and complexity, but the silencer is snug and firm. The article is filled with generic statements we all knew in 2009, and some incorrect statements that conflict with the dozens of articles TTAG has posted in the past on 300BLK; look uo Leghorns articles on 300BLK for good data. Accuracy is hard to figure.I have a real 25 yd range and with the red dot thing on it it stuffs all loads into a ragged hole but the point of impact does vary between them. The 300 Blackout round is an excellent choice for home defense as it combines power and efficiency with lethality when fired from a short-barreled rifle. I want to get a barrel and file a form1 but just havent yet. I dont shoot subsonic. In the chart, Hornady 110gr G-Max Full Boar (2,350 FPS At Muzzle), Hornady 125gr HP American Gunner (2,175 FPS At Muzzle), Hornady 190gr Sub-X Subsonic (1,050 FPS At Muzzle), *Competitive Shooter of the Week* For 300 AAC Blackout, that point is 9 inches of barrel. 300BLK vs. 5.56? Really -- the largest difference is barrel length. Then, you can fine tune your load to the harmonics of the barrel you are using. In my ignorance, I would say its because I want to reduce wear and tear on the suppressor. It didnt take long for engineers at two of the industrys finest to solve the problem, though. Though its a common report that subsonic ammo isnt remarkably accurate for most users, Ive been very pleased with my Remington 700s performance with 208 AMaxs. Wilson Combat 11.3 barrel (worried this is too long) With or without the can. For those who need to run a .30-caliber cartridge from a standard AR15 platform (as opposed to the AR10), the 300 AAC Blackout makes sense. Could you comment further on the ratchet latch on your SDN-6 failing? Thats serious power up close, but that slow speed and heavyweight takes a toll at 500 yards. I need to get the lathe going as well, and I havent had the time or patience to do it. By and large, the relatively rapid loss of velocity confines the 300 Blackout to near medium and close ranges. So heavy a bullet conveys a subsonic muzzle velocity and correspondingly softer report. This guide takes a closer look at the various barrel lengths for the 300 Blackout round and where to find them. With these details in mind, the best .300 Blackout barrel length for hunting is one that can hit long-range targets. However, a 20+ inches barrel may be too unwieldy and impractical for anything but target shooting. Did you get it repaired? 300 Blackout SAAMI Cartridge Specification. On the flip side, having a shorter barrel allows for easier close-combat shooting, which would otherwise be a challenge if you had a nine-inch barrel. A fast burning powder might fully burn in those 9 inch of barrel, but even so, the pressure at the end will still be way higher than it is outside the barrel and hence the accelerating force on the bullet will still be more than friction. Every scrap of experience I have, and every bit of advice Ive ever been given (withthe exception of the black magic that is barrel harmonics), points to the conclusion that barrel length and accuracy have nothing whatsoever to do with each other. Instead, they built the round from the M4-compatible 5.56mm cartridge. The SAAMI diagram for the 300 BLK is shown below. Though the muzzle rise and recoil forces are not entirely negligible, they are not enough to affect follow-up shots for the shooter. It has a very short barrel and runs a long 9 can. For example, if you shoot the same Hornady Sub-X 190-grain load from a 16-inch barrel, it will drop 33 inches at 200 yards a 14-inch improvement over shooting with a 10-inch barrel. WebAt 200 yd (183 m), the 300 BLK drops 2 in (51 mm) lower than the 6.8 SPC, while it drops 30 in (760 mm) lower at 500 yd (457 m). Even at 300 yards holdover is nearly 9 feet. I dont know how the 30BR compares powder quantity wise to the 300 BLK, but that could account for the difference in barrel length. For example, with a 10.5-inch barrel, the .300 Blackout clocks an average velocity of 2200 feet per second. Looks wild. That still wouldnt explain peoples prevailing view of barrel length driving accuracy, since the majority of shooting is not done at extreme distances. Not sure, and maybe Im just splitting hairs. The military roots still show in the selection subsonic loads, although its neighborly friendly to ditch that familiar crack as the bullet breaks the sound barrierwhether its quieted at the muzzle by a suppressor, or not. AAC .300 BLK AR-15, The Gun Blog. Standardized with SAAMI (Sporting Arms and Ammunition Manufacturers' Institute) specs means every design aspect of the .300 Blackout is kept similar, regardless of the manufacturer. Save my name, email, and website in this browser for the next time I comment. Your longer barrel does add minimal velocity. For instance, longer barrels generate more bullet velocity. The 300 Blackouts sleeker bullet has a higher. I dont think they are shipping as of yetwhich is a big question why. WebIn matters of velocity comparison, different barrel lengths for the .300 Blackout sit within the 25-50 feet per second per barrel velocity rule that governs most firearms. It didnt take long for engineers at two of the industrys finest to solve the problem, though. Heavy, slow moving subsonic bullets experience more bullet drop than fast, more aerodynamic bullets. These days, #1 on my list, especially for new silencer owners, is the Liberty Mystic-X. 300 Blackout is taking the shooting world by storm, and for good reason. I doubt you would get extra wear and tear from using supersonic ammo in it. A second stamp for the suppressor, a separate serialized firearm.. Factory Starline and SIG produced 300 HAMR cases are available, but cases can be made from common and available 5.56/.223 cases. This type of software isnt free, but as a one-time purchase its probably the best reloading tool you can get for the price and pays for itself quickly given the price of reloading components youll save. The SAAMI diagram for the 300 BLK is shown below. A 125 gram .300 BLK bullet fired from a 16-inch barrel has an effective range of about 500 yards , while the same ammo shot from a 9-inch barrel has an effective range of about 480 yards. Why Shoot a 300 Blackout? And anything over 75 grain was better with a 1:9 twist. Subsonic .300 Blackout rounds fix this problem by traveling slower than the speed of sound. Spend the money on a decent upper. The 300 BLK shoots .308 caliber bullets. The 300 Blackouts recoil is not significantly different from the 5.5645, and its price isnt prohibitively higher. The 300 Blackouts .30 caliber bullet can be made especially long, and as the result may weigh up to 220 grains quadruple the weight of the typical 223 Rem rounds. However, since a suppressor adds to the length of your gun, you dont want to add a suppressor and make your gun long and clumsy. dear sirs..just want you all to know how much, ..WAY DOWN DEEP IN THE PINEY WOODS WOOTEN. The other had an issue with the gas block; I contacted PSA and they immediately fixed it at no charge and with no questions, and it also has run perfectly since then. 300BLK vs. 5.56? The long Sig Titanium 7,62 is REALLY quiet. Speared on by no issues I built a 10.5 inch pistol with an arm brace LOL. There are a few factors to consider when selecting the ideal barrel length for a 300 BLK rifle and determining its effective range. Stay in touch with Widener's, be the first to know about new articles, products, and more. It is a niche gun not even available to the public. However, a longer barrel will lead to a weightier gun, and you may have trouble wielding it with one hand. Those rounds like a slower twist, something closer to 1:10, but no one seems interested in making a barrel for that. This will make sighting to that farther distance simpler. I have a Sig red dot on my 556 upper and a 4-1240 Bushnell scope on my 300. One of those AI chatbots thats been in the news recently? The length of a barrel also dictates the rifle's twist rate and thus the bullet as it travels down the barrel. I feel strangely compelled to visit faxon.com and view their lineup of 300 blackout barrel lengths. But its the opposite with the 300 AAC? Although they share .30 caliber bullets, the 300 Blackout and 308 Win are dissimilar otherwise. This makes the .300 Blackout an effective, versatile, and reliable close combat round. WARNING: With some bullet options (and setback during chambering) 300 Blackout rounds will go into a .223 chamber and fire. 4 models Rainier Arms AR Ultramatch MOD2 300BLK Barrel $400.00 Final Sale. The only part you need to change is the barrel. Not even from a 300 BLK. Best twist rate for 300 Blackout? Getting away with it because they had deeper pockets (costs a lot to get SAAMI cert) and Remington Defense backing. The more we all know, the better organized and stronger the shooting and hunting community will be. At this point, you should use internal ballistic calculation tools to match your selected variable to the other. As for waiting on Sig Suppressors good luck with that. 21.5Gr shows pressure signs. At a mere 200 yards with a 100 zero, the 300 Blackout drops nearly 5.5 inches more than the 5.56, at 300 yards it drops a whopping 19-inches more. A buddy has a 100yd range in his back yard. Here is the link. Now the ammo costs too much for a niche rifle caliber. For the best experience on our site, be sure to turn on Javascript in your browser. The 115 gr (7.5 g) 6.8-round has a higher muzzle energy of 1,694 ftlb (2,297 J) due to its greater velocity, while the 125 gr (8.1 g) 300 BLK round has a muzzle energy of 1,360 ftlb (1,840 J). With the can on it, it also is ear safe and the 25yd accuracy is like the other one with the same type red dot. Thats the one, and only reason Im so anal about checking mine on the range, or in the field. The barrel should also deliver enough bullet velocity to hit far-off prey with deadly impact. BA, Rosco, WC, and others have all worked immediately without any specialty tuning. Save my name, email, and website in this browser for the next time I comment. This issue isnt unique to 300 Blackout bullets, though. At Ballistic Advantage, we offer high-quality barrels for AR-style rifles, and you can find one with the perfect length to meet your handling and accuracy preferences. Suppressor length is a grey area as it doesnt count as barrel length or open-air (something in-between, depending on internal geometry), but through testing you can predict how a specific suppressor affects your velocity. At this point, frictional (and other opposing) forces will start to DECREASE velocity. The Sporting Arms and Ammunition Manufacturers Institute (SAAMI) approved and published industry standards and specifications for the .300 BLK on Jan. 17, 2011. You remind me of that writer who was a big fan of the .270 back in the Field and Stream days. The 16-inch barrel also provides greater energy on impact, regardless of ammo type. The barrel also plays a role in the drop rate of the bullet. I just ordered a 16 inch barrel and stuck it on my Stag upper. The latter has nearly twice the propellant, and is therefore better able to fell very distant game. Its really hard to find data on accuracy down-range with different lengths and types (prob just go with AAC as they seem well respected, but would really like to find the most accurate nitrided barrel made). A 125 gram .300 BLK bullet fired from a 16-inch barrel has an effective range of about 500 yards, while the same ammo shot from a 9-inch barrel has an effective range of about 480 yards. Ask Foghorn: What Barrel Length for a 300 AAC Blackout Rifle? All these benefits work together to make a 16-inch .300 BLK barrel the best choice for hunting and other forms of long-range shooting. If you want your pistol to have more range, velocity, and accuracy, you can opt for an 8 to 10-inch barrel. Great Barrel Life: With a .30-caliber bore and a modest powder charge, barrel life is outstanding. [Email your firearms-related questions to Ask Foghorn via[emailprotected]. Both use AR-15/M4 magazines and cartridge-carrying capacity is identical. Results are in inches/foot-pounds of energy and based on a 100-yard zero with the scope 1.5 inches above the bore. Even the .357 magnum picks up considerable velocity when shot from a 16 or 18 carbine. but horrible reviews on Trustpilot? OUR GST-9 IS UNAFFECTED BY THE LATEST 12/28 ATF CLARIFICATION LETTER & SHIPS IN 3 DAYS! These loads are heavier than most rounds and feature an adjusted powder charge that delivers peak bullet velocity by combusting completely within short barrels. WebIn matters of velocity comparison, different barrel lengths for the .300 Blackout sit within the 25-50 feet per second per barrel velocity rule that governs most firearms. A big factor of consideration when picking a rifle, its barrel length, or ammunition is the type of target you wish to use it on. Share the post "300 Blackout Basics Specs and Cartridge INFO", Tags: .223 Rem, .300 AAC Blackout, 300 BLK, AR15, Lapua Brass, Suppressor. Cartridge Overall Length: 2.02 inches. While the 300 BLK is easy (and inexpensive) to reload, Remington and AAC recognized that most people are not reloaders. A 20 inch barrel will not hinder you with your AAC. As explained by Robert Silvers, AACs R&D Director: [You can] shoot 30 caliber from your AR while still using normal magazines with full capacity. The muzzle velocity used for 5.56 in the chart is with a 16 barrel, but the 300 BLK is using a 10 barrel. I wonder, though, whether people ascribe greater accuracy to a longer barrel, thinking longer barrel = straighter trajectory, when really its that longer barrel = greater velocity, which in turn implies less susceptibility to random wind movements? Ed Really -- the largest difference is barrel length. COPYRIGHT 2021, THETRUTHABOUTGUNS.COM. The powder needs not only fully burn, but also the products of said burning need to drop in pressure, before you start seeing a decrease in velocity. For example, with a 10.5-inch barrel, the .300 Blackout clocks an average velocity of 2200 feet per second. They had a 1.5 star rating 3 years ago. A mystique surrounds the .300 BLK (AAC Blackout), and it overshadows this utility players ability to deliver All-Star numbers in a variety of roles. 9 AAC 1:7 melonite barrel is the best Ive tested. Supersonic ammo in a 10-inch barrel retains rifle caliber velocities but experiences greater bullet drop at distances. I do anticipate hunting deer / pig with this build supersonic of course. A 9" barrel will allow any 300 BLK cartridge to reach optimal velocity, while an 11.5" barrel will provide a bit more accuracy and stability if you plan on shooting mostly supersonic loads. At 10, the muzzle velocity hasnt yet reached its peak. Out of a cold unit, you will always have a flyer, usually the first shot. Velocities over my 9 AAC barrel are surprisingly mild, about 30-40 FPS for subsonic and about 100 FPS for supersonics. If you already have a favorite .300 Blackout barrel length and are in the market to buy one, check out our selection of premium .300 Blackout barrels. WebThey found the optimal barrel length for 300 BLK is between 9" and 11.5". It gets pretty messy from there. We refer to it as one rotation over a particular inch of barrel. Assuming youre serious about hand-loading, you can purchase internal ballistic software to sort this out from an educated standpoint rather than following rules-of-thumb. I have seen some measurements as high as 123db which is still VERY quiet. From there it really degrades. The .300 AAC Blackout is designed as a variation of the older .300 Whisper ammunition. One of the best things about 300 BLK is that it gets complete burn in a much shorter barrel. I took that pistol with 220 grain ELD-X over 10.6 grains of AA 1680 And hit the 19 plate the second shot with the red dot! Conversely, its lightweight projectile bleeds energy downrange, the reason Hornady lists it as a target shooting and varmint hunting load. .300 Blackout ammo can be loud, especially when shooting supersonic rounds. Notify me of follow-up comments by email. Lets explore all this caliber has to offer including an in-depth look at 300 Blackout Ballistics. The fastertwist rate is perfect for the 220 grain ballistic monsters that subsonic 300 BLK ammunition use, but for the lighter hunting rounds (like Barnes 110gr round) not so much. Converting an AR-15 to fire 300 Blackout is as simple as swapping its barrel. A supersonic 300 Blackout round with a 110 grain bullet has a muzzle velocity approximately 1,000 fps slower than that of a 223 Rem, giving it a significantly faster bullet drop.
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