300 blackout barrel length chart

The 6.5 Grendel is a lower to mid-power 26 caliber cartridge. 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). If you want your pistol to have more range, velocity, and accuracy, you can opt for an 8 to 10-inch barrel. One has operated perfectly right out of the box. _gaq.push(['_trackPageview']); The shorter a gun barrel, the more the gas expulsion at the muzzle equals a relatively louder sound every time you shoot. The 6.5 Grendel is a lower to mid-power 26 caliber cartridge. Kirsten Provides Some Answers, Horner Wins Tactical-Optics Divison At Multigun Nationals, 300 AAC Blackout Load Data from Sierra Bullets, Scary Stuff .300 Blackout Fired in a .223 Rem Barrel, .300 Blackout Fired in .223 Rem AR Recipe for Disaster. Even better, the .300 Blackout barrel comes in various lengths, allowing you to pick a length that best fits your needs. TKS! I want to get a barrel and file a form1 but just havent yet. Yet this unnamed writer says thats incorrect, and the optimum is at 16. 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. 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. A 1:8 twist works best with the light-weight supersonic rounds. There was an article on TTAG maybe a year or so ago comparing velocity loss from from a 5.56 16 vs 10 and a 300BLK from 16 to 9. One of the best things about 300 BLK is that it gets complete burn in a much shorter barrel. This guide takes a closer look at the various barrel lengths for the 300 Blackout round and where to find them. In barrels16 or longer it is going to have a good 100-200 fps over the BLK using 110-115 grain projectiles. When barrel friction on the bullet is greater than gas pressure behind the bullet, the bullet will slow. All the links go to Faxons website. Those rounds like a slower twist, something closer to 1:10, but no one seems interested in making a barrel for that. But its the opposite with the 300 AAC? 300 Blackout Fine-Tuning: Finding the Right Barrel Length for Your Rifle, For optimal performance with a suppressed, Bird Colonel Trashes Tin Eagles With False Testimony in California Assault Weapons Ban Case, Keith Olbermann Calls for Civil War as the Only Way to Stop Mass Shootings, Illinois Freedom Week Starts Today: Federal Court Blocks Enforcement of Illinois Assault Weapons Ban. Heavy, slow moving subsonic bullets experience more bullet drop than fast, more aerodynamic bullets. Accuracy differences would be more apparent in supersonic loads where the transition from supersonic to sonic happens before the target. For 5.56 NATO, that point is 20 of barrel. You can either start with a barrel length, or a baseline load. 300 Blackout is taking the shooting world by storm, and for good reason. I just ordered a 16 inch barrel and stuck it on my Stag upper. 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. As a simple example, shooting Titegroup and Blue Dot out of my SD9VE with a 4 barrel gives almost no meaningful velocity change. Ed But for a lot of shooters, its the ideal do-all round in an AR platform rifle. Barrel twist rate also impacts performance and should be considered when selecting barrel length and determining the effective range of the 300 Blackout. Ive seen a few other suppressors suffer the same fate, for the same reason. I am always available for you. It didnt take long for engineers at two of the industrys finest to solve the problem, though. On a gun you plan to carry, super heavy barrels are not ideal. Eventually, they got their own 300 Blackout cartridge SAAMI approved in 2011. Compared to other ammunition like the 350 Legend, the .300 AAC Blackout is more effective in taking long-range shots. I came here for a clue about what barrel to get for a pistol build, but I know once I have it Im going to want a real stock and a suppressor. Cartridge Overall Length: 2.02 inches. Plus, the long barrel compensates for its rather laborious maneuverability. One of the best things about 300 BLK is that it gets complete burn in a much shorter barrel. Groups 110% of the size of my 16 5R barrel on the 700 test gun. Have had a LOT of different ARs including a Colt upper in 7.6239 that I killed my first deer with! The SAAMI diagram for the 300 BLK is shown below. There is obvious powder burn outside the barrel which is clearly visible on video. If you build an AR pistol, the 300 is the perfect round. At 16-inches, muzzle velocities are near their peak. I hope it will post. If you're looking for a multi-purpose load for the .300 AAC Blackout, this may be the best bullet. So would a better/different suppressor. At this point, you should use internal ballistic calculation tools to match your selected variable to the other. The Harvester is a great suppressor. The only real question is what twist rate to go with. For 300 AAC Blackout, that point is 9 inches of barrel. By and large, the relatively rapid loss of velocity confines the 300 Blackout to near medium and close ranges. ps.the arm brace apparently was deemed legal by ATF for incidental resting on your shoulder. Why Shoot a 300 Blackout? Visit us today to browse the .300 Blackout barrel lengths we have in stock and place an order to receive your selection at your doorstep. Then you can also pick a slightly faster burning powder to get a complete burn in 16 of barrel. WARNING: With some bullet options (and setback during chambering) 300 Blackout rounds will go into a .223 chamber and fire. The 300 Blackouts recoil is not significantly different from the 5.5645, and its price isnt prohibitively higher. They straight stole J.D. Thats 8 inches of barrel for the 300 BLK 1-8. Factory Starline and SIG produced 300 HAMR cases are available, but cases can be made from common and available 5.56/.223 cases. The .300 BLK bullets are 0.30 inch in diameter (7.62 mm) and the .223 Rem (5.56 mm) is 0.224 inch. Thats water weight capacity. Two Colt M16s? SAAMI creates and publishes industry standards for safety, interchangeability, reliability and quality, as well as coordinates technical data for agencies, enthusiasts and manufacturers. but horrible reviews on Trustpilot? And anything over 75 grain was better with a 1:9 twist. The more we all know, the better organized and stronger the shooting and hunting community will be. You would have to cut down and make your OWN 6.75 barrel since SIg will not sell you one of theirs. However, if you try to shoot custom loaded 7.62 x 39 ammo loaded with a 220gn bullet from a 1:10 twist barrel, you will be disappointed because the bullet will not be DRIVEN fast enough to SPIN fast enough to stabilize correctly. Hunting, home defense, and competition style shooting, the .300 AAC Blackout does it all. 8.2 is the shortest Rosco makes and its a really good barrel for me. For an MG with a sub 16 barrel and a suppressor, you only need two stamps, one for the suppressor and one for the MG. Two. The 300 AAC Blackout definitely works for hunters who want to use their AR15-platform rifle. Mike: I cant seem to edit my comment. The. The twist rate is when the bullet twists within a barrel once fired, which helps keep it at a high velocity and helps maintain accuracy. 300BLK vs. 7.62x39? The chief difficulty in accurately firing 300 Blackout comes from learning to accommodate its pronounced bullet drop. Or is it a different type of powder altogether? You forgot one thing in your calculation powder quantity. Pick the barrel length (or performance target) you want and build a load around it then you can come up with some educated rules-of-thumb of your own. Putting a .308-caliber bullet in a .224-diameter barrel is a recipe for disaster. I dont think they are shipping as of yetwhich is a big question why. Be first to know about promotions and new product launches. CQB isnt a place where bright flashes coming out of a barrel are an advantage, so using a 22-inch tube wont help much, if at all. 300 Blackouts effective range can stretch quite a bit depending upon your goals. In the case of .308, if youre doing a bolt gun the longer barrel lengths can make a huge difference if you have the right powders same as my 9mm example. The question that Ive always asked when I look at this is is why hasnt someone figured out one can just as easily make a modern set of 125gr and 220gr 7.6239s and blow away the .300 BLK at its own game? Save my name, email, and website in this browser for the next time I comment. Keep reading to discover the best barrel length for .300 Blackout for different shooting scenarios. For hunting expeditions or other long-range requirements, the .300 AAC Blackout has a maximum effective range of approximately 460 meters. I was thinking something along those lines, too. Perfect for integral suppressor or just using as an SBR/pistol. The length of a barrel also dictates the rifle's twist rate and thus the bullet as it travels down the barrel. (AAC) or have you seen / heard of any better? My purpose is close quarter confined space self defense, not hanging out a helicopter shooting wild boar, although that sounds like a helluva lot of fun. I assume that there is a finite lifespan of the suppressor guts and shooting supersonic ammo at the range kind of defeats part of the suppressor benefit. For example, with a 10.5-inch barrel, the .300 Blackout clocks an average velocity of 2200 feet per second. You are incorrect on one critical detail: Adding more barrel length after that point might still increase the velocity a bit, but the added weight isnt always worth the extra dollop of velocity.. Please tell us more about how awesome it is. Some folks wonder why consider a 300 BLK? Notify me of follow-up comments by email. Scopes For Beginners: What is the Parallax Adjustment Knob and How Do I Use It? WebThe 300-Blackout is a lower-power 30-caliber cartridge. A 20 inch barrel will not hinder you with your AAC. Secondly (and the reason why my second .30 suppressor is fast attach) is that I have multiple firearms that I take to the range and want to be able to quickly switch between them. For example, with a 10.5-inch barrel, the .300 Blackout clocks an average velocity of 2200 feet per second. Velocity will increase as long as there is sufficient pressure behind the bullet to accelerate it. ALL Bulletin content is copyrighted, 2023 AccurateShooter.com. Twitter and other social media icons below. Could you comment further on the ratchet latch on your SDN-6 failing? Supersonic ammo out of a 10-inch barrel retains rifle caliber velocities, but with more significant bullet drop at longer distances. Any insight on following: Spend the money on a decent upper. Had a few questions for you if youd be so kind as to give me a bit of advice . The muzzle velocity used for 5.56 in the chart is with a 16 barrel, but the 300 BLK is using a 10 barrel. Perfect for integral suppressor or just using as an SBR/pistol. As the .30-Cal cartridge of choice for the AR15 platform, the 300 AAC Blackout, also known as 300 BLK, has become quite popular with black rifle owners. I strongly suspect thats where this comes from. The 300 AAC Blackout was created by Advanced Armament Corp. and Remington primarily for the military as a way to shoot .30-caliber bullets from the M4/AR15 platform while using standard magazines. 9 AAC 1:7 melonite barrel is the best Ive tested. Heavy subsonic ammo in a 10-inch barrel may have lower velocities, but allows for the use of a suppressor without damaging your hearing. 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. Velocities over my 9 AAC barrel are surprisingly mild, about 30-40 FPS for subsonic and about 100 FPS for supersonics. Wheres a good source for ballistic data muzzle velocities for various bullet weights , loads, fired from various length barrels. The .300 Blackout is quite effective when hunting for animals like wild pigs, deer, or varmint. If it's inside your house in home-defense scenarios, a short barrel will allow for better maneuverability. And the stellite core will be much more durable than the Harvester (and probably what Sig will come out with). 300 Blackout WAS stolen from 300 Whisper. Armed forces in the U.K., U.S., and other countries use .300 Blackout because its stopping power and suitability for close combat are undeniable. Once all of the powder in the case has been burned, theres no more fuel to add to the combustion and the gasses are at their maximum energy. Jones, tailored for heavy projectiles that do not break the sound barrier (subsonic), was probably best known at the time and popular enough that the term wildcat does not apply. OUR GST-9 IS UNAFFECTED BY THE LATEST 12/28 ATF CLARIFICATION LETTER & SHIPS IN 3 DAYS! Lastly, barrel length affects a bullets twist rate how much a bullet spins within the barrel when fired. FBI: Crime Rate Dropped During 2013, Year of Record Gun Sales. Scroll right to see energy, drop and coefficient data. 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. They result in less range and more bullet drop at distance. What's the Best Barrel Length for .300 Blackout? I had a table at the local gun shows for years. Let your fellow shooters know share this article using the Facebook, Twitter and other social media icons below. Remington now sells a variety of 300 BLK ammo: 1) 125 grain open-tip match with a custom Sierra bullet; 2) 220gr subsonic, and 3) 125gr AccuTip (photo below). But if the amount of gunpowder to be burned is held constant, the length starts becoming a drawback. In large part because of PSAKs being very dangerous garbage until very recently. The article is a little wordy but does a decent job of explaining that the best barrel length depends on what optimal performance means to you. 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. If I had an adjustable gas block maybe but in reality I probably need Rifle+2 gas. If you get too close to your prey, you may spook it, causing it to run off before you can shoot. So, I dont know, but its all very interesting to me. However, if you want to hit targets at over 100 yards, the best barrel length for .300 Blackout subsonic is 16 inches. Personally, if I had to do it all over again, I would definitely not go with a 762-SDN-6. Why would you detach your suppressor for supersonic ammo? They lack the mass to carry a proportionate level of energy at downrange, though. Not sure, and maybe Im just splitting hairs. The 9 300 blackout barrel is the best overall barrel length with or without a suppressor, especially since an 8 barrel is the minimum warranty barrel length for many suppressor manufacturers. 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. Affordable Factory 300 BLK Ammo is Available will be fine. With these details in mind, the best .300 Blackout barrel length for hunting is one that can hit long-range targets. Although the 300 Blackouts effective range depends on the shooter and application, the chart above provides rough guidelines for consideration. 2) would you build again with the same silencer? Whether you decide to go long or short on your barrel is entirely a matter of what you are shooting at and where the shooting is taking place. Muzzle Velocity: 2,259 fps. What happened was the Sig Brace. So anyway, as I said, I did not bother to do anything but read about reloading dataknew nothing about over or under gassing or any of the other weird things. All you need is a bigger diameter barrel. I dont know how the 30BR compares powder quantity wise to the 300 BLK, but that could account for the difference in barrel length. 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. What failed exactly? The well-known terminal performance of that Sub-X bullet, however, does make the load an ear-friendly option for some who hunt at relatively short distances. It gets pretty messy from there. Regardless of the position it plays, the .300 BLKs performance often hinges on finding the best barrel length and load combination for the distance you have in mind. Wideners offers a variety of loads, in bullet weights that vary from 110- to 220-grains. This makes the .300 Blackout an effective, versatile, and reliable close combat 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. If you want a compact package with acceptable performance out of both supersonic and subsonic loads, then 8-10 is a good compromise. Now the ammo costs too much for a niche rifle caliber. ALL RIGHTS RESERVED. Converting an AR-15 to fire 300 Blackout is as simple as swapping its barrel. Daniel Squ, Brass-cased ammo generally outpaces steel in every, *Competitive Shooter of the Week* I was at first considering a 9" barrel with a 1:7 rifling, for that is what the cartridge was designed around. One important consideration before you set out to build your AR-15 in the .300 Blackout is knowing the scope of usage of your gun. It gives an almost negligible muzzle rise while shooting, meaning most of the energy produced during recoil comes back to the shooter's shoulders. 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. I think you still have cut the barrel down if you want a shorter barrel. Niche it may be, but it is exceptionally useful in that niche. Here is the link. They can run any barrel length without an additional stamp. To add Im also a lefty so want to manage the gas as much as can be done. This is because most operators commend the high stopping power of the 300 Blackout in close-combat engagements compared to other ammunition issues. Dennis- 300 BLK starts with a 5.56 casing that they neck down much shorter, allowing for a wider and longer bullet that can now weigh significantly more than any 5.56 can. or youll solve them. The SDN just doesnt silence 300 Black very well. I then hit it 15 times in a row. This was years ago and PSA was no help at all. Easy Conversion: Use your current AR lower, bolt/carrier, buffer, and magazine. 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. However, a longer barrel will lead to a weightier gun, and you may have trouble wielding it with one hand. For optimal home defense with the 300 Blackout round, a barrel length of at least 6 to 8 is recommended. When picking an upper for the setup, you can go either with a T-Marked or a Non-T-Marked, depending on your personal preference. And using the 5.56 casing and same length round (from casing base to bullet tip) means they can use 5.56 magazines with no capacity loss. 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. 2. 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. Because the Blackout is wider, yet they tend to have similar weight, the Blackout has a lower Ballistic Coefficient than the 6.5 Grendel. Most AR-15 upper 300 Blackout rifles feature the 1:7 and 1:8 twist rate, which is the rifle barrels spin rate. Because the Blackout is wider, yet they tend to have similar weight, the Blackout has a lower Ballistic Coefficient than the 6.5 Grendel. Copyright Ammotogo.com 2023 All Rights Reserved. Exactly what Int19h (?) Comparing my 5.56 barrels (18.5, 14.5 and 10.3) is a whole different story. Longer barrels can be more accurate when using fixed sights, because a longer sight radius allows for finer adjustment of aim. Even though it is short, a 6-inch barrel can generate enough velocity to hit close-range targets. The Hornady Sub-X 190-grain load, for example, exits the muzzle of a 16-inch barrel at 1,050 fps, where it is carrying 465 foot-pounds of energy. Dont forget that longer barrel = greater sight distance for iron sights. Converting an AR-15 to fire 300 Blackout is as simple as swapping its barrel. So you can ball on a budget and just buy the barrel and make the swap when needed-or buy just brand new upper already setup for 300 BLK and throw it on your existing lower. Great info Nick. For optimal performance with a suppressed 300 Blackout, we recommend a barrel length of 8-10. Another reason why 9 to 10 inches is the best overall .300 Blackout barrel length is the minimal muzzle rise and comfortable recoil. Attaching a 6 suppressor to this barrel length results in a total length of 14 to 16, which provides optimal muzzle velocity for accurate long-range shots. Also, always, always check your .223 magazines to ensure no 300 BLK rounds worked their way in when you loaded the mags. A buddy has a 100yd range in his back yard. Most bullets from both cartridges weigh around 125-Grains. I recommend the Silencerco Omega FTW. creates and publishes industry standards for safety, interchangeability, reliability and quality, as well as coordinates technical data for agencies, enthusiasts and manufacturers. 110gr Barnes VOR-TX. 9 models V Seven 300 AAC Blackout Stainless Match Barrel (8) As Low As (Save Up to $10.00) $359.99 Best Rated. A very hot load in 300BLK I use is 120gr Nosler BTHP with 21.0Gr H110. Would be really nice to be accurate (reliably hit 12x12 target at 200..maybe 250 yards?) How is the recoil of the 6.8 vs 300 Blackout? Attaching a 6 suppressor to this barrel length results in a total length of 14 to 16, which provides optimal muzzle velocity for accurate long-range shots. 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. I make my living building high end audio equipment, I cant afford ear damage. Share the post "300 Blackout Basics Specs and Cartridge INFO", Tags: .223 Rem, .300 AAC Blackout, 300 BLK, AR15, Lapua Brass, Suppressor. Drop is predictable; wobble is not. A 9 to 10-inch .300 Blackout barrel keeps a gun portable and short enough to wield easily. The best option is one that youre not going to like: wait. And it is VERY quiet AND compact. All the pics are Faxon barrels. Instead, they built the round from the M4-compatible 5.56mm cartridge. You have entered an incorrect email address! 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. The muzzle velocity used for 5.56 in the chart is with a 16 barrel, but the 300 BLK is using a 10 barrel. A longer barrel, because of its increased surface area, provides more room for cooling in instances where you shoot continuously. Not even from a 300 BLK. 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. Stay in touch with Widener's, be the first to know about new articles, products, and more. Seems a waste of powder if all it does is make a boom at the end. 9 models V Seven 300 AAC Blackout Stainless Match Barrel (8) As Low As (Save Up to $10.00) $359.99 Best Rated. Don't believe in them, and never will. Longer barrels are not automatically more accurate. Its an efficient round, but probably gets max velocity from 18-24 or maybe even 26 of barrel length. Theres no shortage of creativity among enthusiasts when it comes to the search for that holy grail of loads. Getting away with it because they had deeper pockets (costs a lot to get SAAMI cert) and Remington Defense backing. The 30 BR is expected to shoot sub .5 MOA out to 300 meters and weight is at a premium for most of these guns. 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. Most AR-15 upper 300 Blackout rifles feature the 1:7 and 1:8 twist rate, which is the rifle barrels spin rate. Shorter barrels are ideal if you want a concealable and easy-to-carry gun, while a longer barrel is the best choice for optimal accuracy. Converting an AR-15 to fire 300 Blackout is as simple as swapping its barrel. He never got it to run right and put too much money into it. For long-range targets, barrel lengths of up to 16 inches are available. I was amazed at myself. 1:8 or increasingly, 1:7, especially if you want to stabilize subsonic, LONG bullets at low temperatures. Attaching a 6 suppressor to this barrel length results in a total length of 14 to 16, which provides optimal muzzle velocity for accurate long-range shots. There its drop is more than 30 feet (with a 100-yard zero) and energy drops to 309 foot-pounds. Having internal ballistic software to play with is an eye-opener in a lot of ways for example Ill never have a .308 longer than a 20 in. I have two .300 BLK uppers from PSA. Web5 models Noveske Lo-Pro Gas Block 300 AAC Blackout Barrel (1) As Low As (Save Up to 14%) $351.50 Final Sale. As a result, heavy-grain subsonic bullets struggle to retain their subsonic terminal performance, while supersonic ammo has increased effective range and reduced bullet drop. 300BLK vs. 7.62x39? I would look into making/getting a telescopic suppressor (reflex design). 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. If thats a factor, then it would maybe only come into play at great distances? If the .300 BLK is good enough for the U.K. and U.S. military, its more than enough for home defense. CLICK HERE to see actual 300 BLK in .223 Rem chamber. I have 2 Colt M-16s that Im going to convert to 300 Blackout. Not a bad question at all. Like you stated, as long as there is more pressure pushing the bullet forward than barrel friction retarding it, the bullet will continue to accelerate. Nothing further than that is as effective since the gunpowder burning would be inefficient in the spare room. Also, the 300 BLK shoots faster from a 16 barrel than a 9 barrel, particularly with supersonic loads. Though there is a lot of talk among gun enthusiasts about the nine-inch sweet spot of barrel length when it comes to the .300 Blackout, the ammo works well with different variations of barrel lengths and uppers. WebThey found the optimal barrel length for 300 BLK is between 9" and 11.5". Such large projectiles convey a subsonic muzzle velocity that is accompanied by a quiet report. . Really -- the largest difference is barrel length. Muzzle Velocity: 2,259 fps. http://blog.silencershop.com/300-blk-impressions/ A longer barrel also offers a long line of sight for you to better aim your rifle even if the rifle is not equipped with sight extensions. Adjustible Gas Block??? So heavy a bullet conveys a subsonic muzzle velocity and correspondingly softer report. WebThe 300-Blackout is a lower-power 30-caliber cartridge. My .308 and my 300 BLK are both capable of pushing the same size bullet, but the .308 has way more space in the case for powder than does the 300 BLK. 300BLK vs. 5.56? Having the barrel + suppressor be only 9+4 inches (13) long would be neato. Its not going to be long until you want to suppress it and/or SBR it. Nowhere above did anyone mention the gas port or that once the bullet passes the gas port theres a significant reduction in pressure pushing the bullet and significantly more drag due to friction .

Arclight Fabrication Shirt, How To Sell A Crystal Chandelier, Articles OTHER