300 blk velocity barrel length

Best Barrel Length for 300 BLK? Moderators: gds, bakerjw, renegade. 15 posts 1; 2; Next; jhertzler Member Posts: 11 Joined: Wed Jan 29, 2014 5:01 pm. Best Barrel Length for 300 BLK? Post by jhertzler » Wed Jan 29, 2014 5:07 pm. I am about to "pull the trigger" on a new 300 BLK upper for my AR15. There are two options for the one I want, …

However, the heavier Blackout retains more of that energy downrange, having over 130 ft./lbs. more than the 5.56mm round at 300 yards, and 180 ft./lbs. more at 500 yards. In short, the baseline Blackout has 60 percent more foot pounds of energy per round at 500 yards than the 5.56 and is akin to the 7.62x39mm M43 round used around …The forearm and barrel assembly swap out readily. There have been rumors that a 5.56mm conversion is in the making, but to a certain degree this would defeat the purpose of the gun. What really makes the Rattler unique is its .300 BLK chambering. The .300 BLK is essentially a .30-caliber bullet seated into a slightly modified 5.56mm casing.Most any 30-cal rifle can will work on short 300 BLK barrels. ... As stated - depends on the can for barrel length - my Rugged Obsidian is good down to an 8 inch barrel for supers. I have (2) 300 BO uppers. ... A higher twist rate bleeds velocity in short barrels so you get to a point of equal returns.Case Trim: 1.358” Barrel Length: 16” Twist Rate: 1:8” Barrel: Krieger 300 AAC Blackout 300 AAC Blacout Maximum Loads Should Be Used With Caution - Always Start With Minimum Loads. ... Velocity (fps) Charge (grains) Velocity (fps) H110 16.5 1980 17.5 2150 120-grain TAC-TX BTConflicting sentiments are recession fears and supply concerns are affecting the price. Good morning, Quartz readers! Oil prices rose again after dipping below $100 a barrel on Tue...When AAC developed the round it was developed around 8-8.5” barrels. Kevin Brittingham of Q was the designer and owner of AAC at the time. His current guns run 7” barrels with 1:5 twist. So I’d say based on the barrel I’d go with 7-8.5 if I …The 300 AAC Blackout cartridge — also known as 300 BLK or 7.62x35 — is both powerful and versatile, making it an easy favorite for a huge number of AR-15 owners. This rimless, bottleneck design was specifically developed for use with short-barreled military AR-15s and offers incredibly quiet function with subsonic ammo and a …

When we compare the two shells, the overall length is basically the same at 57mm. The 5.56mm typically weighs 55 gr, 62 gr, and 63 gr, which is noticeably lighter.300 BLK typically weighs 78 gr, 110 gr, and 125 gr. As a result, the 300 BLK’s perceived recoil sound has been identified as more robust than the standard 5.56mm bullet.Quoted: The .300 Blackout was developed by AAC and they report the optimal barrel length for both subsonic and supersonic is 9". However, untold numbers of people have had excellent results using 7.5 to 10.5" pistol barrels. Maximum Most efficient velocity vs length is supposedly reached @ 9".1M views 4 years ago. What barrel length is best for 300BLK AR-15s? 300BLK vs. 5.56? 300BLK vs. 7.62x39? Best twist rate for 300 Blackout? Let's find out! ...more.Nov 29, 2023 · The ideal barrel length when hunting with .300 Blackout is one able to reach long-range targets with sufficient bullet velocity and energy on target for a lethal impact. Longer barrel lengths offer greater accuracy and velocity, with a maximum length of 16″ for the .300 Blackout. This .300 Blackout chambered 10.5 inch Modern Series Barrel is machined from CrMoV steel with a QPQ Corrosion Resistant Finish and QPQ coated M4 feed ramp extension. All NFA/ATF Rules Apply. You may use this barrel with a lower receiver that is a Registered SBR, Machine Gun, or Pistol. Possession of this barrel along with a Non-NFA lower ...Watch this video to find out how to cut a fence panel to length. Expert Advice On Improving Your Home Videos Latest View All Guides Latest View All Radio Show Latest View All Podca...

You're reviewing: 10.5" .300 Blackout Pistol Length AR 15 Barrel, Modern Series Your Rating. Overall. 1 star 2 stars 3 stars 4 stars 5 stars. Nickname. Summary. Review. Submit Review. Related Products ; 5.56 Complete Bolt Carrier Group, Nickel Boron. Rating: 100 % of 100. 6 Reviews Add Your Review. $184.99. View Detail ;BARREL LENGTH RESTRICTIONS The 36M and 46M are rated for barrels as short as 10” for .223 Remington/5.56mm NATO, 16” barrels for .308 Winchester/7.62mm NATO, and 18” barrels for .300 Winchester Magnum and .338 Lapua Magnum. Additionally, the Hybrid 46M is rated down to 16˝ barrels for 45–70 and 458 SOCOM. The Hybrid is rated down toStainless Lo-Pro Gas Block Barrel 300 Blackout. $ 320.00 – $ 470.00. BARREL LENGTH. Choose BARREL LENGTH 7.94" Diplomat 10.5" Shorty 12.5" Crusader 14.5" Afghan 16" Recon. HEADSPACED BOLT. Choose HEADSPACED BOLT Yes No Clear. Stainless Lo-Pro Gas Block Barrel 300 Blackout quantity. Add to cart.Feb 16, 2023 · Best Barrel Length For Suppressed 300 Blackout. For optimal performance with a suppressed 300 Blackout, we recommend a barrel length of 8″-10″. 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. For the longer range engagements ... Mar 10, 2023 · Popular barrel lengths for .300 Blackout range from 16 inches to 5.5 inches. The use cases of these two barrel lengths are very different. But they’re both fairly common among shooters, which speaks to the versatility of the Blackout.

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Test barrel length: 16 in. The .300 AAC Blackout (designated as the 300 BLK by the SAAMI [1] and 300 AAC Blackout by the C.I.P. [2] ), also known as 7.62×35mm, is an intermediate cartridge developed in the United States by Advanced Armament Corporation (AAC) for use in the M4 carbine. The cartridge yields increased performance in shorter ...The 300 HAMR is very accurate because the twist rate pertains to a set bullet length and velocity. However, the 300 blk was designed for both supersonic and subsonic ammo, making the twist rate a bit vague. Photo ... This round can achieve terminal performance with just nine inches or barrel length and can work with both supersonic and subsonic ...Calibers like 5.56 benefit from longer barrels and gain maximum velocity from a longer barrel. 5.56 vs .300 BLK in PMAGs. ... Cartridges like the original .223 Remington and 5.56 meet their peak velocity from a rifle-length barrel. Cartridges like the .224 Valkyrie benefit from the 20-inch barrels. The famed 6.5 Grendel works best with …Jan 30, 2019 · View Quote. If you're shooting subsonic .300BLK, it's because you are suppressing it. A suppressor adds 6-9" to the barrel length typically. So, you want as short a barrel are practical. 8.5" is traditional, but a lot of folks are trying 7.5" and 6.5". Posted: 1/29/2019 2:02:21 PM EDT.

Cor-Bon subsonic data is: .300 Blackout 240 grain; muzzle velocity 1000 FPS, muzzle energy 533 ft-lbs. That is more muzzle energy than a 230-grain .45 ACP load yet includes the ability to fire more accurately and at greater distance while utilizing the same 30-round magazines you already have.Velocities out of the 7.5” and 10.5” barrels for AAC .300 Blackout 110 gr V-MAX offering. The speeds were taken using the ProChrono DLX. Averages are at the ...10.5 in. 2500 ft/sec. 200 yards. If you’re astute, you may have noticed a trend here. Each inch you cut off of a barrel will reduce the speed of a 5.56 round by about 50 feet per second, give or take. The AR-15 is the most popular gun chambered in 5.56. Photo courtesy of docmonstereyes.Many people get speed and velocity confused. It's no surprise because the terms are often used interchangeably. But they're not quite the same thing. So how do you find the velocit...An important fact to remember, you need velocity (perhaps greater than 2,000 f.p.s.) to penetrate common ballistic vests. A rifle with a nine inch barrel shooting .300 BLK will fall below that velocity quickly — within 100 yards — versus 5.56x45mm NATO which will stay above 2,000 f.p.s. at least to 400 yards.You're reviewing: 10.5" .300 Blackout Pistol Length AR 15 Barrel, Modern Series Your Rating. Overall. 1 star 2 stars 3 stars 4 stars 5 stars. Nickname. Summary. Review. Submit Review. Related Products ; 5.56 Complete Bolt Carrier Group, Nickel Boron. Rating: 100 % of 100. 6 Reviews Add Your Review. $184.99. View Detail ;The .300 BLK has easily been the most successful new caliber in the last 20 years. Besides the easy conversion between 5.56 and .300 BLK, the .300 BLK does a lot the 5.56 can’t. First off, it’s a very versatile load with projectiles weights ranging from 110 grains to 220 grains. (L to R) 5.56 NATO, .300 BLK, .30 Carbine.We would like to show you a description here but the site won’t allow us.The muzzle velocity used for 5.56 in the chart is with a 16” barrel, but the 300 BLK is using a 10” barrel. One of the best things about 300 BLK is that it gets complete burn in a much shorter barrel.Both 5.56 NATO and .300 Blackout bring a lot to the table in terms of performance, with each typically shooting flat and accurate out to 200 yards from a carbine-length barrel. W. Whereas the Blackout delivers a more barrier-blind terminal effect per round than the slighter 5.56 and carries both better terminal ballistics and more energy …In physics, the three types of acceleration are changes in speed, direction and both simultaneously. The word “velocity” is often used in place of speed. A person can calculate the...

The theoretical perfect length for 300 blk is 10 inches. Less and you give up velocity, more and you lose velocity due to having expended the available charge and the excess barrel slows the round. By the way, barrel length affects bigger calibers less than smaller calibers. This is a general rule of reloading.

With a 9" barrel and 7" shroud length the overall length would meet the 16" requirement w/ or without the suppressor. With a 9" suppressor, 2" would extend beyond the shroud and the overall barrel length would be 18". I would shoot subs and supers, and would develop loads for both.Sep 28, 2023 · The 8.6 Blackout, also known as 8.6 BLK or 8.6mm Creedmoor, is the brainchild of the innovative team at Q LLC. Envisioned as the “big brother” to the 300 Blackout, the 8.6 BLK is to the AR-10 platform what the 300BLK has been for the AR-15. With its roots in the 6.5 Creedmoor parent case, the 8.6 BLK cartridge is trimmed and necked up to ... An important fact to remember, you need velocity (perhaps greater than 2,000 f.p.s.) to penetrate common ballistic vests. A rifle with a nine inch barrel shooting .300 BLK will fall below that velocity quickly …Also, there are no "heavy, high bc bullets" for 300 blackout unless you're shooting subsonics, which defeats the purpose of having a longer barrel for more velocity. And yes, i can shoot my 300 blk pistol as accurately as a rifle because a pistol brace is effectively a stock. It sounds like you don't know what you want to me.The forearm and barrel assembly swap out readily. There have been rumors that a 5.56mm conversion is in the making, but to a certain degree this would defeat the purpose of the gun. What really makes the Rattler unique is its .300 BLK chambering. The .300 BLK is essentially a .30-caliber bullet seated into a slightly modified 5.56mm casing. The people that made the 300BLK designed it for specific purposes and ballistics. Lots of reloads have verified that 9.5 is the right length. "Nine inches of barrel will give you the perfect balance of light weight and velocity with the 300 BLK cartridge. It was designed to burn in short barrels and anything more is really just excess weight. So in a 223/556 you are completely right, that round gets full powder burn around 18 inch of barrel length. So shorter than 18 means more flash/noise. A 300 blk however gets full powder burn in about 9 inches. So the flash and concussion will be less than a 223 in a comparable length. A 5inch blackout gets really loud. Welcome to Ballistics By The Inch, or 'BBTI' as people have taken to calling it. Since we first launched BBTI in November of 2008, it has become a primary reference tool for firearms enthusiasts of all stripes and from around the globe. Our initial research data covered the relationship between barrel length and velocity for some 13 common ... May 17, 2022 · The Faxon Firearms AR-15 Barrels .300 Blackout Gunner Profile comes in three distinct barrel lengths, two pistol barrels at 7.5″ and 10.5″ and a legal carbine 16″ barrel. The QPQ nitride finish with an additional NP3 coating makes this barrel nearly impervious to surface wear, rust, and corrosion. Welcome to Ballistics By The Inch, or 'BBTI' as people have taken to calling it. Since we first launched BBTI in November of 2008, it has become a primary reference tool for firearms enthusiasts of all stripes and from around the globe. Our initial research data covered the relationship between barrel length and velocity for some 13 common ...

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The 8.6 Blackout is widely spoken of as the “big brother” of 300 Blackout. The new caliber, developed by Q, completely re-imagines energy on target by using a faster twist rate – 1:3, compared to the popular twist rates of 1:7 and 1:8 for calibers like 5.56 NATO and 300 BLK. Details on Shooting 8.6 Blackout with Q's Kevin Brittingham.Follow these prescriptions to get the most out of the .300 AAC Blackout. ... Length: 1.77 inches Muzzle Velocity: ... a CVA Scout with a 16-inch barrel. Maximum velocity deviation dropped from 139 ...The 300 HAMR is very accurate because the twist rate pertains to a set bullet length and velocity. However, the 300 blk was designed for both supersonic and subsonic ammo, making the twist rate a bit vague. Photo ... This round can achieve terminal performance with just nine inches or barrel length and can work with both supersonic and subsonic ...The 300 BLK shoots .308 caliber bullets. 3. Suppressor-Friendly: You can shoot heavier bullets subsonic. The subsonic capabilities of the 300 BLK make it ideal for use with a suppressed AR. 4. Great Barrel Life: With a .30-caliber bore and a modest powder charge, barrel life is outstanding. 5.I currently have a Sig MCX Gen2 rifle - 16" barrel. To me a 300 BLK does not need anything close to a 16" barrel. So I am going to do a velocity by the inch analysis - I will chronograph loads and cut the barrel down 1" at a time & then shoot the I will be concerned about supersonic & subsonic performance. The supersonic will be …The Rattler length of 5.5" gives up a considerable amount of energy to the 6.75" and 9" barrels when shooting supersonic rounds. If you were shooting subsonic rounds there's much less velocity difference between the 5.5", 6.75", and 9" barrels. I wouldn't go for the 5" if it were my gun. I do have one 6.75" Virtus with Sig's SLH762C for the ...If you’re not familiar with 300 Blackout, it uses 5.56 bolts and magazines, and a modified 5.56 case that’s shortened 10mm and necked up to .30 caliber. The advantages of 5.56 mags and the strength of a 5.56 bolt, as well as .308 diameter projectiles, make this a much better choice than 7.62×39 for the AR-15 platform.Setting the azimuth on your satellite dish simply means pointing the dish in the proper direction using a magnetic compass. Communications satellites maintain a geosynchronous orbi... ….

BlackRock's boss says that active managers increasingly use passive investment products. Human fund managers haven’t gotten much love lately. They often fail to beat broad market i...My 9 inch barrel and barnes tac-tx handloads leave the barrel at about 2150 fps. The minimum stated expansion velocity is 1300 fps. They are still well above that at 200 yards, ~1680fps. With AR scope height of 2.75 inches that is 7 inches of drop at 200yds with a 100 yard zero.Jun 5, 2023 · For optimal performance with a suppressed 300 Blackout, we (Faxon Firearms) recommend a barrel length of 8″-10″. 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. Has anyone compared muzzle velocity between a 14.5 inch and 16 inch barrel? I want to use it for deer hunting and I wonder if the added 1.5 inches will help. I want to use the 135 grain sierra varmiter in the 300 blackout.The 8.6 Blackout, also known as 8.6 BLK or 8.6mm Creedmoor, is the brainchild of the innovative team at Q LLC. Envisioned as the “big brother” to the 300 Blackout, the 8.6 BLK is to the AR-10 platform what the 300BLK has been for the AR-15. With its roots in the 6.5 Creedmoor parent case, the 8.6 BLK cartridge is trimmed and necked up to ...1M views 4 years ago. What barrel length is best for 300BLK AR-15s? 300BLK vs. 5.56? 300BLK vs. 7.62x39? Best twist rate for 300 Blackout? Let's find out! ...more.Q: What is the standard barrel length for 300 AAC BLACKOUT? A: The SAAMI standard is 16 inches instead of the normal 24 inches for other rifles cartridges. We felt that 24 inches was unrealistic, and would lead to inflated velocity numbers on factory ammo, if the ammo were reported for a long barrel length that no one actually used.The ideal barrel length for a 300 Blackout hunting rifle is typically between 8 to 16 inches. See 3,000+ New Gun Deals HERE. 300 blk velocity barrel length, There is no practical weight difference between a 556/223 AR-15 and a 300 BLK AR-15 with the same barrel length. The short casing of 300 Blackout facilitates the powder to burn quickly and allows gas to build up much more effectively in a short barrel. This gives 300 BLK an edge over 5.56×45mm to achieve much greater muzzle energy …, It only takes a barrel of around 8-9" to burn all the powder. And the fps gain is not significant enough to go with anything longer. The draw of the 300 BO is you get an effective 30 caliber super in a small package and it uses existing 5.56 parts (minus the barrel). The subsonics are also about the quitest centerfire round out there with a can ..., At this point, increasing barrel length only provides marginal increases in velocity. The optimal barrel length for 300 Blackout is 9 inches. ... Best Gas System Length. Even though subsonic 300 BLK bullets usually weigh twice as much as supersonic loads, the powder in the case itself has to be reduced to keep the round traveling under 1,125 ..., 300 win mag 300 blk 300 blk subsonic caliber 223 rem 22-250 rem 243 win 300 blk subsonic (9" caliber 223 rem 300 blk 243 win 6mm creedmoor 6.5 creedmoor 308 win 260 rem 270 win 30-06 sprg 300 win mag caliber 243 win 6 mm creedmoor 6.5 creedmoor 260 rem 270 win 7mm rem mag 308 win 30-06 sprg 300 win mag barrel) bullet weight (grains) 107 140 140, Nov 13, 2014 · Adding more barrel length after that point might still increase the velocity a bit, but the added weight isn’t always worth the extra dollop of velocity. For 5.56 NATO, that point is 20″ of barrel. For 300 AAC Blackout, that point is 9 inches of barrel. , Watch this video to find out how to cut a fence panel to length. Expert Advice On Improving Your Home Videos Latest View All Guides Latest View All Radio Show Latest View All Podca..., That's the largest at-sea buildup since October 2020, when global energy markets were still reeling from the COVID-19 pandemic. Jump to As much as 1.9 million barrels of Russian di..., My 9 inch barrel and barnes tac-tx handloads leave the barrel at about 2150 fps. The minimum stated expansion velocity is 1300 fps. They are still well above that at 200 yards, ~1680fps. With AR scope height of 2.75 inches that is 7 inches of drop at 200yds with a 100 yard zero. , Test barrel length: 16 in. The .300 AAC Blackout (designated as the 300 BLK by the SAAMI [1] and 300 AAC Blackout by the C.I.P. [2] ), also known as 7.62×35mm, is an intermediate cartridge developed in the United States by Advanced Armament Corporation (AAC) for use in the M4 carbine. The cartridge yields increased performance in shorter ..., Deals and other cool finds https://linktr.ee/alabama_arsenal"This video is for educational and entertainment purposes only. All guns displayed off the range..., I cut back a 28″ barrel 308 Winchester one inch at a time, to 16.5″, and recorded velocity data for four different cartridges. The data was summarized in 308 Winchester / 7.62x51mm NATO: Barrel Length versus Velocity (28″ to 16.5″). This post provides Rifleshooter.com’s readers the complete data set for Winchester 147 grain FMJ ..., 300 Blackout 110 gr V-MAX® Hornady BLACK ® Item #80873 | 20/Box . Hornady BLACK ® ammunition features versatile loads optimized for excellent performance from America’s favorite guns. Loaded with legendary Hornady ® bullets, Hornady BLACK ® ammunition is designed to fit, feed and function in a variety of platforms. Find a Retailer , The people that made the 300BLK designed it for specific purposes and ballistics. Lots of reloads have verified that 9.5 is the right length. "Nine inches of barrel will give you the perfect balance of light weight and velocity with the 300 BLK cartridge. It was designed to burn in short barrels and anything more is really just excess weight., So in a 223/556 you are completely right, that round gets full powder burn around 18 inch of barrel length. So shorter than 18 means more flash/noise. A 300 blk however gets full powder burn in about 9 inches. So the flash and concussion will be less than a 223 in a comparable length. A 5inch blackout gets really loud., When it comes to .300 Blackout pistols, Daniel has a great chrome-lined 10.3-inch model with a 1:8 twist and heavy Mil-spec heavy phosphate coating that is hard to beat. Weight is a handy 20-ounces. 5. Diamondback .300 AAC Blackout Pistol-Length Barrel. , Around 13” is where the ft lbs really seem to not grow much per inch, the gain is cut about in half after that point. 300blk is effective in short barrels but long barrels still put out more energy, much like 7.62x39. 8. Reply. prmoore11., The 8.6 Blackout is widely spoken of as the “big brother” of 300 Blackout. The new caliber, developed by Q, completely re-imagines energy on target by using a faster twist rate – 1:3, compared to the popular twist rates of 1:7 and 1:8 for calibers like 5.56 NATO and 300 BLK. Details on Shooting 8.6 Blackout with Q's Kevin Brittingham., imherefortheprocess. •. 300aac was created for the sole intention of subsonic shooting out of a short barrel for CQB. If you are shooting 110gn, than you chose the wrong caliber for your application. There's is a miniscule amount of velocity difference out of subsonic rounds between a 5.5" barrel and a 50" barrel., The 300 AAC (Advanced Armament Corporation) Blackout (designated 300 BLK by SAAMI) is a 7.82mm caliber designed to outperform in terminal ballistics over the 5.56 NATO/.223 Remington. It’s designed for the AR platform and delivers superb knock-down power in close-quarter battles. The 5.56 NATO still reigns supreme in the military, police, …, The Bottom Line on 300 Blackout Ammo. The 300 Blackout is a rifle cartridge that’s more powerful than the 5.56 when fired out of a barrel that’s less than 16 inches long. The chief advantage of 300 Blackout is its versatility. You won’t find a cartridge that “does it all” better than the 300 Blackout., Jan 30, 2019 · View Quote. If you're shooting subsonic .300BLK, it's because you are suppressing it. A suppressor adds 6-9" to the barrel length typically. So, you want as short a barrel are practical. 8.5" is traditional, but a lot of folks are trying 7.5" and 6.5". Posted: 1/29/2019 2:02:21 PM EDT. , Using 500 meters as a benchmark, a NATO standard 5.56x45mm M855 projectile fired at 2,900 FPS will have 100 inches of drop, 41 inches of drift, and 291 ft.-lbs. of energy at that distance. In contrast, a .300 Blackout 125 grain projectile at 2,220 FPS has: 100 inches drop at 440 meters. 41 inches drift at 484 meters. , For optimal home defense with the .300 Blackout, a barrel length of at least 6″ to 8″ is recommended. Best 300 Blackout Barrel Length For Home Defense. 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., In physics, the three types of acceleration are changes in speed, direction and both simultaneously. The word “velocity” is often used in place of speed. A person can calculate the..., So in a 223/556 you are completely right, that round gets full powder burn around 18 inch of barrel length. So shorter than 18 means more flash/noise. A 300 blk however gets full powder burn in about 9 inches. So the flash and concussion will be less than a 223 in a comparable length. A 5inch blackout gets really loud. , Jul 19, 2020 ... Comments558 ; How Much Does Barrel Length Affect .300 Blackout Bullet Velocity? ClassicFirearms · 223K views ; #10MinuteTalk - 300 Blackout: ..., Get free real-time information on USD/BLK quotes including USD/BLK live chart. Indices Commodities Currencies Stocks, In recent years, Saturn has overtaken Jupiter as the planet with the most moons in our solar system. How many does it have and could it have even more? Advertisement There's a race..., Also, there are no "heavy, high bc bullets" for 300 blackout unless you're shooting subsonics, which defeats the purpose of having a longer barrel for more velocity. And yes, i can shoot my 300 blk pistol as accurately as a rifle because a pistol brace is effectively a stock. It sounds like you don't know what you want to me., Welcome to Ballistics By The Inch, or 'BBTI' as people have taken to calling it. Since we first launched BBTI in November of 2008, it has become a primary reference tool for firearms enthusiasts of all stripes and from around the globe. Our initial research data covered the relationship between barrel length and velocity for some 13 common ..., The 300 BLK shoots .308 caliber bullets. 3. Suppressor-Friendly: You can shoot heavier bullets subsonic. The subsonic capabilities of the 300 BLK make it ideal for use with a suppressed AR. 4. Great Barrel Life: With a .30-caliber bore and a modest powder charge, barrel life is outstanding. 5., When AAC developed the round it was developed around 8-8.5” barrels. Kevin Brittingham of Q was the designer and owner of AAC at the time. His current guns run 7” barrels with 1:5 twist. So I’d say based on the barrel I’d go with 7-8.5 if I …, The barrel length is great for squeezing the most out of the .300 Blackout with a suppressor while still being shorter than most conventional rifles. ... and efficient. It’s big, heavy, and capable of being used in short platforms without a huge velocity penalty. Subsonic .300 Blackout rounds. It really is a wonder round that compliments the ...