300 blk velocity barrel length

This calculator will produce a ballistic trajectory chart that shows the bullet drop, bullet energy, windage, and velocity. It will a produce a line graph showing the bullet drop and flight path of the bullet. By adding …

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.Advertisement The barrel of a flintlock is its own technological marvel, especially for the time. A blacksmith would take a flat piece of iron and beat it into a cylindrical shape ...We would like to show you a description here but the site won’t allow us.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 chart above shows the large advantage the 300 HAM'R has over the 300 BLACKOUT or 7.62×39 at common hunting ranges. The 300 HAM'R has 18% more retained velocity, 40% more energy and a 56% flatter trajectory than the 300 BLACKOUT at 200 yards! 300 HAM'R. 16.25” Barrel. Sierra 110gr HP 2600FPS MV, 1651FP ME.Watch this video about the Tuscany Rain Barrel from Fiskars which comes complete with a diverter that attaches to your downspout to make installation easy. Expert Advice On Improvi...That's because, as long as the gas is expanding and contained in the barrel, the bullet will accelerate. Based on that, the 300blk behaves more like a magnum pistol round than a rifle one - small case volume with fast burning powder. The fast powder means it burns up quick enough for a shorter barrel.

Jan 5, 2019 ... AAA channel: https://www.youtube.com/channel/UCTdlOymjE55N6wsuUsGNNMQ SUPPORT STKO HERE: https://www.amazon.com/shop/shoottokilloutdoors ...Quoted: For 110 grain Barnes in a 8.5 inch barrel I have seen different velocities, usually falling in somewhere around 2100-2150. Wilson combat has the Hottest advertised velocity of 2400, that should net about 2200 from a 8.5. A 10.5 inch will get you about 100 fps more then a 8.5 with the same round.8 .300 Blackout. 8.1 Best Barrel Length For .300 Blackout. 8.1.1 For Subsonic Loads. 8.1.2 For Maximum Velocity. 8.1.3 Best Overall Barrel Length for .300 Blackout. 9 .32 ACP. …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...The best barrel length for a suppressed 300 Blackout is between 8 to 10 inches. At 10", the muzzle velocity hasn't reached its peak yet. Heavy subsonic 300 Blackout ammo in a 10" barrel may have lower velocities, but it allows for the use of a suppressor without damaging your hearing. Supersonic ammo out of a 10" barrel retains …

People are dining in "quarantine greenhouses" and using items like pool noodles and bumper car tables to dine out in public. We live in a weird new world, my friends. As stay-at-ho...That said Google 300 blk velocity barrel length and look at the image tab. In my opinion, a 16 in barrel in 300 blackout is a better hunting rifle than a 5.56 at any length or a 300 blk with a shorter barrel. Nothing wrong with having one 300 blk 8.5 inch pistol on every floor for home defense and one 16 inch hunting 300 blk carbine.Oct 25, 2020 · 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. That said Google 300 blk velocity barrel length and look at the image tab. In my opinion, a 16 in barrel in 300 blackout is a better hunting rifle than a 5.56 at any length or a 300 blk with a shorter barrel. Nothing wrong with having one 300 blk 8.5 inch pistol on every floor for home defense and one 16 inch hunting 300 blk carbine.

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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...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.Muzzle velocity and barrel length. Discussion about rifles in 300 AAC BLACKOUT (7.62x35mm), hosted by the creator of the cartridge. Moderators: gds, bakerjw, renegade. 19 posts 1; 2; Next; Bgd Senior Silent Operator Posts: 149 Joined: Mon Jul 18, 2016 3:02 am Location: AR. Muzzle velocity and barrel length.Nov 22, 2014 · 56. Jan 10, 2020. #1. I have an AR15 chambered in the Wilson Combat 300 Ham'r with a 16.25" barrel. Load data on the Wilson website shows 2450-2500 fps with either AA1680 or CFE BLK and the Speer 130gr Hot Cor bullet. Problem is I'm only getting 2260 (Labradar) with a max charge of CFE BLK. I know some of the loss is due to Wilson's 18" test ... Overnight the U.S. national debt clock whirled past $30T for the first time in history....UPS Breathing in the madness Spitting out the lies Searching for an answer Keep your alibi...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 ...

56. Jan 10, 2020. #1. I have an AR15 chambered in the Wilson Combat 300 Ham'r with a 16.25" barrel. Load data on the Wilson website shows 2450-2500 fps with either AA1680 or CFE BLK and the Speer 130gr Hot Cor bullet. Problem is I'm only getting 2260 (Labradar) with a max charge of CFE BLK. I know some of the loss is due to Wilson's 18" test ...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 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.A shorter barrel is known to be louder with a 556 gun but with 300 blackout I have actually heard that a 6.25 inch barrel like the KAK baby blond will be the best if looking for maximum suppression since velocity …300 Blackout Full-Auto AR-15. The rifle used in this story is a “special custom” full-auto AR-15. Note: Ultimate Reloader is a Type 07 Firearms Manufacturer (FFL) and Class 2 SOT, otherwise this would be illegal. Some information about the rifle follows: Upper: Anderson Manufacturing AR-15 300 Blackout Upper: 16″ Carbine length barrel, …8 .300 Blackout. 8.1 Best Barrel Length For .300 Blackout. 8.1.1 For Subsonic Loads. 8.1.2 For Maximum Velocity. 8.1.3 Best Overall Barrel Length for .300 Blackout. 9 .32 ACP. …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 18 …From there, each barrel goes through a battery of tests at each operation until finished in Nitride and final inspected. All barrels are individually checked for headspace with precision PTG gauges. Barrel Material: 4150 CMV. Barrel Type: Button Rifled. Barrel Caliber: 300 BLK. Barrel Twist: 1:8. Barrel Length: 10.5”. Barrel Profile: GUNNER.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.Ever ponder how long that email should be? He's a guide to help you decide the best word count bang for your buck! Written by Alex Sobal @asobal_weidert Whenever your teacher assig...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.Overall I tend to prefer my 10” 300blk vs my 7.5” for the added rail space, increased velocity with supers and it’s much less picky with subs (increased dwell time). Reply reply. armada127. •. 8" personally one of the neat advantages of 300BLK imo is the ability to go shorter than 10". Reply reply.

Though .300 BLK has gotten a bit more affordable at the range, it’s still not as cheap at 5.56 and 7.62. That’s why we suggest buying in bulk to keep the cost per round down. For that, we go with US Cartridge. You can get 200 rounds of 147-grain for a reasonable $135 – not bad if you’re doing training at the range.

300 AAC Blackout: BT: 125: 1406: 2250: 300 AAC Blackout: DPX: 110: 1407: 2400: Double Tap Ammunition Ballistics: Round Type Weight Muzzle Energy ft·lb Muzzle Velocity ft/sec. 300 AAC Blackout: Barnes TSX: 110: 1407: 2400: 300 AAC Blackout: Sierra ® Matchking: 240: 561: 1025: PNW Arms Ammunition Ballistics: Round Type Weight Muzzle Energy ft ... I'm currently looking for a 300 blk barrel, but I am conflicted on the twist rate and length. I'm taking into account bullet grain weight and cost as well. I've seen on online cost of 300 blk and it's a small difference $19 dollars for lower grain cartridges and $25 for higher grain cartridges (box of 25), but in all a difference for my wallet.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".Yes. Most 300 Blackout loads reach their full velocity within 10″ of barrel length and many in 8″ or so. There’s a huge market of projectiles designed specifically for the caliber in both supersonic (which is the typical choice for hunting use) and subsonic flavors. There’s at least a dozen options for 300 BLK projectiles that reliably ...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... Barrel Length, Velocity, and Energy. A wide range of barrel lengths work well for building your 300 BLK-chambered rifle or pistol. The twist rate matters most for achieving proper stability and accuracy, but we'll get to that in a moment. Let's take a look at barrel length and performance, first. 300 BLK Barrel Length vs. Velocity 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.

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300 AAC Blackout: BT: 125: 1406: 2250: 300 AAC Blackout: DPX: 110: 1407: 2400: Double Tap Ammunition Ballistics: Round Type Weight Muzzle Energy ft·lb Muzzle Velocity ft/sec. 300 AAC Blackout: Barnes TSX: 110: 1407: 2400: 300 AAC Blackout: Sierra ® Matchking: 240: 561: 1025: PNW Arms Ammunition Ballistics: Round Type Weight Muzzle Energy ft ... 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.In 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. For example, with a 10.5-inch barrel, the .300 Blackout clocks an average velocity of 2200 feet per second.Depends. For sub, yeah it’s close. That length is great for keeping subsonic projectiles subsonic for most barrels in that range and most subsonic rounds. Longer barrels with higher twist rates will speed up your bullet and approach that sound barrier limit. Also certain round weight will impact velocity (190 grain to 220 grain). 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 with a suppressed 300 Blackout, use a 16 ... Feb 16, 2017 · I'm also going by what most people consider to be the optimum barrel length of 300 BLK: 9". Read any forum discussion on 300 BLK barrel length and most people will say 9" is optimum. The real world shooting demonstrates that shooting 300 BLK out of 9" barrel gives no flash, meaning complete powder burn has occurred. Yes. Most 300 Blackout loads reach their full velocity within 10″ of barrel length and many in 8″ or so. There’s a huge market of projectiles designed specifically for the caliber in both supersonic (which is the typical choice for hunting use) and subsonic flavors. There’s at least a dozen options for 300 BLK projectiles that reliably ...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 ...Bear Creek Arsenal AR-15 .300 Blackout 16in Parkerized Heavy Rifle Barrels $82.99 Buy Direct. 3 models CBC Industries 300 AAC Blackout AR-15 Barrel, 5/8x24, 1-8, Pistol Length (3) As Low As (Save Up to 43%) $85.56 12% Coupon. Bear Creek Arsenal AR-15 .300 Blackout 7.5in Heavy Pistol Barrels $86.99 Buy Direct.NOTE: At 10:47 - the LWRCI DI rifle is NOT suppressed.Looking for a product featured in this video? YouTube prevents us from posting links. Head over to our ...The shortest effective barrel length for this caliber is somewhat of a balancing act between maintaining reasonable velocity, accuracy, and power. 6-inch Minimum: The shortest barrel length we recommend for the .300 Blackout is 6 inches. This is based on extensive testing and feedback from shooters. ….

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.56. Jan 10, 2020. #1. I have an AR15 chambered in the Wilson Combat 300 Ham'r with a 16.25" barrel. Load data on the Wilson website shows 2450-2500 fps with either AA1680 or CFE BLK and the Speer 130gr Hot Cor bullet. Problem is I'm only getting 2260 (Labradar) with a max charge of CFE BLK. I know some of the loss is due to Wilson's 18" test ...Lower parts kit. Trigger assembly. Buffer assembly. Bolt carrier group. Upper receiver. Handguard. Magazine. These are the only parts that are exclusive to .300 BLK: Barrel. …People are dining in "quarantine greenhouses" and using items like pool noodles and bumper car tables to dine out in public. We live in a weird new world, my friends. As stay-at-ho...Shooter's Reference Load Data for .300 AAC Blackout. .300 AAC Blackout - Published Manufacturer Loading Data. Shellholders: Hornady #16. Lee #4. Lyman #26. RCBS #10. Recipe Type: Rifle.300 BLK: Barrel Length: 16" Manuf. Process: Cold Hammer Forged: Twist Rate: 1:8: Muzzle Thread: 5 ⁄ 8 × 24 TPI (Threads Per Inch) ... GunTec handguard, Daniel Defense, .300 AAC Blackout, 16", strength-to-weight. Lower is a Seekins, with a Velocity 3-pound trigger. Optic is a straight 4X Leupold. Handloaded ammo is a 110 grain, Hornady VMax ...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.Most of us could use more storage space in our bathrooms, and this DIY project hides lots of storage space behind a full-length mirror in an attractive wooden frame. Most of us cou...According to Nosler, AccuBonds expand at velocities down to 1,800 fps, and a little calculating with a ballistic program indicated the .300 HAM’R load should expand easily at 200 yards, and probably 250. Sighted-in 1.5 inches high at 100 yards, the bullet lands 1.5 inches below point of aim at 200, and 6 inches down at 250.That said Google 300 blk velocity barrel length and look at the image tab. In my opinion, a 16 in barrel in 300 blackout is a better hunting rifle than a 5.56 at any length or a 300 blk with a shorter barrel. Nothing wrong with having one 300 blk 8.5 inch pistol on every floor for home defense and one 16 inch hunting 300 blk carbine. 300 blk velocity barrel length, The 300 Blackout cartridge yields increased performance in shorter barrels and effective subsonic performance. By speeding up the twist rate to 1:5 from common 300 BLK rates of 1:7 and 1:8, the Faxon 6" Match Series Gunner Barrel increases projectile stabilization and energy on target. Barrel Material: 416-R Stainless Steel., 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., 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., 300 AAC Blackout: BT: 125: 1406: 2250: 300 AAC Blackout: DPX: 110: 1407: 2400: Double Tap Ammunition Ballistics: Round Type Weight Muzzle Energy ft·lb Muzzle Velocity ft/sec. 300 AAC Blackout: Barnes TSX: 110: 1407: 2400: 300 AAC Blackout: Sierra ® Matchking: 240: 561: 1025: PNW Arms Ammunition Ballistics: Round Type Weight Muzzle Energy ft ... , 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 ..., Key Takeaways. The 300 Blackout is a rifle cartridge that’s more powerful than 5.56/.223 (AR-15 ammo) when fired out of a barrel that’s less than 16 inches long and works …, 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., Cracker Barrel Old Country Store News: This is the News-site for the company Cracker Barrel Old Country Store on Markets Insider Indices Commodities Currencies Stocks, Tankers, trains, even caves: Oil producers are scrambling to find a place to store their product. At beginning of this year, oil in the United States was selling for around $60 a b..., gunmade ... Loading..., Feb 15, 2024 ... 8:57 · Go to channel · 300 Blackout Barrel Lengths and Affects on Velocity. Silencer School EP.5. Alabama Arsenal•210K views · 11:33 · ..., Tankers, trains, even caves: Oil producers are scrambling to find a place to store their product. At beginning of this year, oil in the United States was selling for around $60 a b..., 300 blackout was designed to operate from shorter barrels by using pistol powder instead of rifle powder so it can get full burn. If you're going to do longer than 10.5", consider getting a 11.5" 5.56 instead because it will be much cheaper to shoot and far …, The ideal barrel length when hunting with .300 BLK is one able to reach long-range targets with sufficient bullet velocity and energy on target for a lethal impact. Longer barrel …, Stainless 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., 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. , 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., At 16 inches, .300 Blackout barrel muzzle velocity is close to its peak, giving you a powerful weapon for making accurate long-range shots. If you want the longest range with a suppressed .300 Blackout barrel, get a 16-inch barrel and add a suppressor., This calculator will produce a ballistic trajectory chart that shows the bullet drop, bullet energy, windage, and velocity. It will a produce a line graph showing the bullet drop and flight path of the bullet. By adding …, Shooter's Reference Load Data for .300 AAC Blackout. .300 AAC Blackout - Published Manufacturer Loading Data. Shellholders: Hornady #16. Lee #4. Lyman #26. RCBS #10. Recipe Type: Rifle., Jul 19, 2020 ... Comments558 ; How Much Does Barrel Length Affect .300 Blackout Bullet Velocity? ClassicFirearms · 223K views ; #10MinuteTalk - 300 Blackout: ..., At the top of Vomero Hill in Naples, Italy sits Castel Sant'Elmo, a medieval fortress dating back to the 14th century that offers visitors majestic views of ... At the top of Vomer..., Jul 3, 2023 · The best barrel length for a suppressed 300 Blackout is between 8 to 10 inches. At 10", the muzzle velocity hasn't reached its peak yet. Heavy subsonic 300 Blackout ammo in a 10" barrel may have lower velocities, but it allows for the use of a suppressor without damaging your hearing. Supersonic ammo out of a 10" barrel retains rifle caliber ... , May 22, 2019 ... Quick video testing supersonic and subsonic 300BLK ammo through different barrel lengths. Nine Line Apparel Shirts [including Warheads on ..., In 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. For example, with a 10.5-inch barrel, the .300 Blackout clocks an average velocity of 2200 feet per second., Quoted: For 110 grain Barnes in a 8.5 inch barrel I have seen different velocities, usually falling in somewhere around 2100-2150. Wilson combat has the Hottest advertised velocity of 2400, that should net about 2200 from a 8.5. A 10.5 inch will get you about 100 fps more then a 8.5 with the same round., 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 …, 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..., 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., With an overall case length of 35mm, the 300 BLK has a case capacity of approximately 19.2 grains. ... then by all means go for it! But if you are looking for a compact, maneuverable, suppressed SBR then a 9-inch barrel 300 Blackout is hard to beat. 5.56 vs .300 Blackout: Self-Defense ... 300 Blackout Bullet WEIGHT Muzzle VELOCITY (fps) …, The shortest effective barrel length for this caliber is somewhat of a balancing act between maintaining reasonable velocity, accuracy, and power. 6-inch Minimum: The shortest barrel length we recommend for the .300 Blackout is 6 inches. This is based on extensive testing and feedback from shooters., Depends. For sub, yeah it’s close. That length is great for keeping subsonic projectiles subsonic for most barrels in that range and most subsonic rounds. Longer barrels with higher twist rates will speed up your bullet and approach that sound barrier limit. Also certain round weight will impact velocity (190 grain to 220 grain)., 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 ...