300 blk velocity barrel length

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.

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 …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 ...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.Cracker Barrel Old Country Store (CBRL) just sufffered a punch to the gut from its short-lived investment in Punch Bowl Social, and the big charge Cracker Barrel just took to write...This homemade rain barrel for recycling rainwater for use in your lawn and garden is an easy do-it-yourself project that costs less than $50. Watch this video to find out how. Expe...Twist: 1:5 twist for the 7″ barrel, 1:6 twist for the 16″ barrel. Assembly Weight : .97 lbs (7″), 1.8 lbs (16″) Muzzle Thread: 5/8-24. First, I want to reiterate that the .300 AAC Blackout ...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 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.Aug 10, 2021 · Really -- the largest difference is barrel length. 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. Perfect for integral suppressor or just using as an SBR/pistol. Best Barrel Length For .300 Blackout For Subsonic Loads. Based on the data above, it appears that for subsonic loads such as 220 grain (where the .300 BLK really shines), barrel length can be an afterthought, particularly if you plan on using a suppressor. Something like a 7.5" barrel with an appropriate 7 to 8 inch suppressor would allow for a ...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 …Originally designed to operate in short barreled rifles (SBR) and pistol-length barrels, the 300 BLK reaches peak ballistic potential from a nine-inch barrel. It is the most obvious advantage compared to a 20-inch barrel that requires 5.56 to reach peak ballistic performance. ... with a muzzle velocity of 1,900 fps, surely this 300 BLK ammo …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 ...

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...In the United States, the minimum legal barrel length of a shotgun is 18 inches. Shotguns with shorter barrels must be federally registered and are subject to taxation. These legal...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.This product is a 10.5-inch barrel with the pistol gas system. The barrel features a heavy profile and is apt for continuous shooting. The 1:8 twist rate is ideal for 300 Blackout loads between 115 to 165 grains. The barrels feature a SOCOM contour and have been manufactured from 4150 V steel.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.

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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. 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.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".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.Re: Muzzle velocity and barrel length. by bangbangping » Fri Oct 21, 2016 7:55 pm. Bgd wrote: I want to use the 135 grain sierra varmiter in the 300 blackout. I don't know what kind of velocity you're looking for, but you don't need a whole heck of a lot with that bullet. Here's a pic of what I could find of one that went into 10% gel at ~2000 ...Yes. The Honey Badger by Q has a 7” barrel, the SIG .300 MCX Canebrake and Rattler has a 5.5” barrel. Both seem to be effective barrel lengths in that caliber, in my unprofessional opinion. 7.5” is fine, there’s 300blk barrels around 5”. Full powder burn only takes 9”. That’s not true.

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 …Velocity is a vector quantity measured in units of length per time. Using the United States customary unit of measurement, velocity is typically given in miles per hour, commonly a...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...Odin Works 300 BLK AR-15 Barrel 1:8 Pistol Length Medium Contour 16.1" w/Gas Block. View Details. $313.50 . In Stock . Odin Works 300 BLK AR-15 Barrel 1:8 Carbine Length Medium Contour 16.1" w/Gas Block. View Details. $313.50 . In Stock . Guntec USA 300 AAC Blackout Pistol Length AR-15 Barrel - 10.5"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.Introduction. Released by Winchester in 1952 (and adopted by NATO in 1954 as the 7.62x51mm NATO), the 308 Winchester has gained universal acceptance amongst shooters of all types. Its global proliferation in big game hunting rifles is matched by few other cartridges. Nearly every target shooter had his teeth cut on a 308 Winchester.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 ...Twist: 1:5 twist for the 7″ barrel, 1:6 twist for the 16″ barrel. Assembly Weight : .97 lbs (7″), 1.8 lbs (16″) Muzzle Thread: 5/8-24. First, I want to reiterate that the .300 AAC Blackout ...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...

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 ...

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 ...This homemade rain barrel for recycling rainwater for use in your lawn and garden is an easy do-it-yourself project that costs less than $50. Watch this video to find out how. Expe...The 'optimum' barrel length for .300 BLK is 16". My SBR is 10.5" with a 1:7 twist and it works just fine. Posted: 4/22/2022 9:13:38 PM EDT. [#18] 16" is probably the ideal length from a ballistics perspective but not ideal from a "get the best out of the gun" perspective. That ideal is closer to 10" plus or minus.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 …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 ...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 …How Much Does Barrel Length Affect .300 Blackout Bullet Velocity? - YouTube. How Much Does Barrel Length Affect .300 Blackout Bullet Velocity? ClassicFirearms. …

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Howdy, I would be interested in seeing someone take a 20" barrel and test the velocity by cutting off one inch at a time down to 6 or 7". One of the groups that I follow on Facebook ( don't remember which one) has done this with various calibers from the .338 Lapua, .300WM, .308, 7.62x54R, to .223. A similar test for the 300 BLK would be great.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 CV (constant velocity) axle shafts on a Toyota Corolla integrate the transaxle of the front wheel drive transmission with the wheel. There are two joint bearings on each end of...Aug 3, 2023 · 300 Blackout Effective Range For 9" Barrel. From a 9-inch barrel, the 300 AAC Blackout 125 grain bullet has a maximum effective range of 440 meters. This is because the bullet drops 100 inches at 410 meters, drifts 41 inches at 470 meters, and has 291 foot-pounds of energy at 625 meters. Most 9" 300 blackout barrels can achieve this performance ... Designed for 300 BLK; SAAMI Max OAL: 2.260″ Maximum Velocity: 1300 FPS; Test Rifle. For the testing performed as a part of putting this article together, I used the following AR-15 rifle configuration: Anderson Manufacturing AR-15 300 Blackout Upper: 16″ Carbine length barrel, 1:8 twist; Carbine length gas setup5.56, .300 BLK, 6.5 Grendel, 6.8 SPC ... Once you start chopping barrel length down, you start killing ballistic performance. ... Velocity from my 16” Bison Armory barrel is 2925. It shoots sub MOA. I’ve used Bison Armory and ARP barrels for my AR builds with excellent results and I use X-Caliber barrels for my savage bolt action builds. …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 ... The 16 inch barrel data are used here, for all cartridges, because 16 inches is the most prevalent barrel length for AR-15 rifles. Here are the velocity in feet-per-second (fps) and energy in foot-pounds (ft. lbs.) figures for our comparison loads at the muzzle, 100, 200 and 250 yards. The loads are listed in descending order of their MV. 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. 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 ... 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 … ….

So let’s dive into the 300 Blackout vs 308 vs 7.62×39 debate as it relates to shorter barrels. The 300 Blackout vs 308 vs 7.62×39 in Short Barrels. First, they inquired about well-known and widely manufactured calibers. ... Not bad, but 7.62x39mm doesn’t have a high enough velocity, even with a full-length barrel. 300 Blackout.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 … 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 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 ; 300 AAC Blackout uggested Bullet se Maximum Loads Should Be Used With Caution - Always Start With Minimum Loads. *Recommended Powder C Compressed Load 2 110-grain TAC-TX FB Sectional Density .166 Ballistic Coefficient .289 C.O.A.L 2.250” Powder Minimum Maximum Charge (grains) Velocity (fps) Charge (grains) Velocity (fps) H110 16.5 1980 17.5 ... 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 ...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. For optimal performance with a suppressed 300 Blackout, we recommend a barrel length of 8-10 inches. Attaching a 6-inch suppressor to this barrel length results in a total length of … 300 blk velocity barrel length, Jul 19, 2020 ... Comments558 ; How Much Does Barrel Length Affect .300 Blackout Bullet Velocity? ClassicFirearms · 223K views ; #10MinuteTalk - 300 Blackout: ..., 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, Feb 15, 2023 · 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 ... , 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 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., The 300 Blackout’s .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 round’s. So heavy a bullet conveys a subsonic muzzle velocity and correspondingly softer report., 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 formula for finding the acceleration of a bullet is A = v^2/2l, or velocity squared divided by two times the barrel length. Velocity means muzzle velocity, or the speed at whic..., The maximum effective range for 300 blackout when fired from a 16" barrel is 460 meters with maximum muzzle velocity, or 503 yards. This is the farthest distance you can expect to hit your target accurately with this cartridge. But remember, the 300 Blackout might not keep at least 260 ft lbs of energy at every point throughout that range., Learn how to choose the best barrel length for .300 Blackout ammo depending on your shooting scenario. Compare the pros and cons of different barrel lengths for suppressed, …, Apr 27, 2020 · You will usually be getting 2,300 to 2,400 fps in a 16.3-inch barrel; that isn’t great for lethality. On the plus side, you can drop the barrel length down to around 11 inches and you will only be losing about 150 to 200 fps. Not bad, but 7.62x39mm doesn’t have a high enough velocity, even with a full-length barrel. 300 Blackout , The ideal barrel length for a 300 Blackout hunting rifle is typically between 8 to 16 inches. See 3,000+ New Gun Deals HERE., 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, and ... , 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., gunmade ... Loading..., 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 ..., Barrel length significantly impacts velocity. Short barrels favor subsonic ammo. Long barrels take advantage of supersonic ammo’s potential. Ammo development continues to push 300 BLK’s capabilities for hunting and self-defense. Regular practice is essential to understand your rifle’s practical effective range., 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., 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 ..., I’ve always stated my home-defense gun is a Mossberg 12 gauge loaded with 00 Buckshot, but the PDX offers more maneuverability than my Mossberg 500 and the power of 5.56mm, 7.62mm x 39mm, or a .300 BLK bullet. A gun like the Maxim Defense PDX is only 18.75" and can be chambered in the same caliber as any other AR at twice the PDX’s overall ..., 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 was building another. My current one is 8.5”. 4., 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. , 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. , Feb 15, 2023 · 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 ... , 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., 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 formula for finding the acceleration of a bullet is A = v^2/2l, or velocity squared divided by two times the barrel length. Velocity means muzzle velocity, or the speed at whic..., 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 ... , Conflicting 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..., Some of you have probably seen this, but it's still a great reference for others. They key take away point is that 300BLK has a much lower velocity loss as you shorten the barrel versus 5.56 NATO. The colors highlight where the rounds are at fairly equivalent ft-lbs. energy. The take away there is a 10" 300BLK will have roughly the same energy ..., Oct 21, 2016 · 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 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, and ..., 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.