For example, with a 10.5-inch barrel, the .300 Blackout clocks an average velocity of 2200 feet per second. Why would you detach your suppressor for supersonic ammo? The accuracy of a .300 Blackout barrel will depend on the exact round and barrel length you use. It happened that way because when the Russians developed the round, all of their 7.62mm barrel making machinery was built to make 1:10 twist barrels for a bazillion Mosin Nagants and a swag of machine guns in 7.62 x 54R. A second stamp for the suppressor, a separate serialized firearm.. 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. If thats a factor, then it would maybe only come into play at great distances? The 300 Blackouts sleeker bullet has a higher. What's the Best Barrel Length for .300 Blackout? Did you ever wonder why PSA always has 5 star reviews on their website 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. Only specific barrel and ammo testing will tell, though. 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. SAAMI creates and publishes industry standards for safety, interchangeability, reliability and quality, as well as coordinates technical data for agencies, enthusiasts and manufacturers. Nothing further than that is as effective since the gunpowder burning would be inefficient in the spare room. PWS is as close as you can get right now. For those with suppressors, the 1:7 twist favors the heavier subsonic rounds. WebSince 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. Basically, machine guns get exempt from the stamp for a shorter barrel. Dumb question- How many stamps would an M16 with a short barrel and a suppressor require? Now its a chicken and egg thing. Our initial research data covered the relationship between barrel length and velocity for some 13 common handgun calibers/cartridges. But for hunters using a bolt gun, there are any number of tried and true options, such as the 7.6239, .30-30, and, of course, the .308 Winchester (7.6251 NATO). Really -- the largest difference is barrel length. 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. 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. A lighter gun via barrel would allow more other things to be used. Drop is predictable; wobble is not. Since its suppressed, the other deer in the area dont seem to mind either.. However, a longer barrel will lead to a weightier gun, and you may have trouble wielding it with one hand. Dennis, running 7.6239 in an AR has a whole bunch of issues on its own. anyone have a good reliable source for ballistics of the most commonly commercially available and popular 300 blackout roundish relation to barrel length and rifling? Although the 300 Blackouts effective range depends on the shooter and application, the chart above provides rough guidelines for consideration. A fast attach lets me do that. 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. However, since a suppressor adds to the length of your gun, you dont want to add a suppressor and make your gun long and clumsy. Ive had no problems with PSAs Cust Service. That number comes from multiple conversations with the people who designed the 300 AAC Blackout cartridge, did the initial testing, and who continue to design guns around that caliber. This was years ago and PSA was no help at all. Play around with powders too much handloading and you screw up the timing on the gas system. Not even from a 300 BLK. (function() { Velocity will increase as long as there is sufficient pressure behind the bullet to accelerate it. While you can have a 9-inch .300 BLK barrel pistol, the best barrel length for .300 Blackout pistol is 6 inches. Tyler Krenzel, While the AR-10 has been around for decades, there, *Competitive Shooter of the Week* Yeah, but 9 barrel in a folder housed in a backpack is absolutely useless in .308 or 5.56. Flash can under the handguard is sexy and with a 10-inch 300 Win mag rated can is 35.5 inches OAL Always thought of the 300 as a niche caliber, but Im good with that. The fastertwist rate is perfect for the 220 grain ballistic monsters that subsonic 300 BLK ammunition use, but for the lighter hunting rounds (like Barnes 110gr round) not so much. That did more to spark interest in NFA items than anything. Maybe not so much that the longer barrel is directly responsible for greater accuracy, but indirectly? Theres no shortage of creativity among enthusiasts when it comes to the search for that holy grail of loads. or youll solve them. Reader Pete writes: Hi Nick,I live in Amarillo and really enjoyed your article on your 300 BLK build. Groups 110% of the size of my 16 5R barrel on the 700 test gun. If I had an adjustable gas block maybe but in reality I probably need Rifle+2 gas. Note that they used exactly the same twist on the TT30 and TT33 auto pistols and millions of SMGs chambered in 7.62 x 25. Ballistically, the .300 AAC Blackout has almost 17% more energy at 300 meters than the 7.62 x 39 round. All you need is a bigger diameter barrel. Any length over that will actually result in lower velocities. 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. 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. There is no real difference in muzzle blast from either, both rifles use identical Surefire brakes. The LAST thing you want is a wobbly bullet going through your expensive muffler, not quite behaving itself. Ask Foghorn: What Barrel Length for a 300 AAC Blackout Rifle? Everything from .22lr to subsonic .308 Winchester, and even 5.56 NATO from a 16 barrel. I was at first considering a 9" barrel with a 1:7 rifling, for that is what the cartridge was designed around. Wondering if you know if theres a significant advantage in range with a 10.5 (both sub and super-sonic). Would a shorter barrel make it quieter? And now for the killer..I dumped ALL my 5.56 stuff, all of it including the progressive press set up just for it, and went full in on 300 BLK. Nobody shows pics like mine because it was not big dealnothing to talk about. They first looked to the 7.6239 for inspiration. There are a few factors to consider when selecting the ideal barrel length for a 300 BLK rifle and determining its effective range. But shortening the guns usually has resulted in less accuracy. If you look up brown recluse or rattlesnake bites on the internet youll be scared shitless from the images. Sure, you could just leave the suppressor attached, but Id rather not have it see the wear and tear if it doesnt need to. Yet this unnamed writer says thats incorrect, and the optimum is at 16. With these details in mind, the best .300 Blackout barrel length for hunting is one that can hit long-range targets. said. AAC didnt develop a damned thing. 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. 1) Barrel length? For .22LR, for instance, the optimum length is 16. A more rigid barrel is better. WARNING: With some bullet options (and setback during chambering) 300 Blackout rounds will go into a .223 chamber and fire. For example, the Hornady Sub-X 190-grain load shot from a 10-inch barrel flies at 1,050 fps and drops 47.6 feet at 200 yards. A long barrel also provides the runway a bullet needs to stabilize fully before exiting the muzzle. For the best experience on our site, be sure to turn on Javascript in your browser. For 5.56 NATO, that point is 20 of barrel. 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). Eventually, they got their own 300 Blackout cartridge SAAMI approved in 2011. The catch is on a semi auto you may wind up with weirdness around pressure curves. I was understanding that my 5.56 with 55 grain bullet needed a twist of 1:7 to be right. Much better QD system than AAC, and with the replaceable mounts, you can even go direct thread if you want. And it is VERY quiet AND compact. 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. First of all, with 300 BLK, if you are switching from supersonic to subsonic rounds, you might want to be able to quickly make the change from unsuppressed to suppressed. Longer barrels also screw up the timing, 16 with carbine gas is on the outside fringe of reliable for the 300. In the chart, bold-faced entries indicate the last distance at which each Hornady load drops less than 5 feet in different length barrelsfor those uncomfortable dialing in or holding over 60 inches. Best Barrel Length For Suppressed 300 Blackout For optimal performance with a suppressed 300 Blackout, we recommend a barrel length of 8-10. There is, however, a point of diminishing returns. 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 . 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. If you are shooting supersonic loads, a 16 barrel gives you more velocity. Some powders should not fill the case because of their density and overpressure problems with that much powder. I have 2 Colt M-16s that Im going to convert to 300 Blackout. The 300 AAC Blackout delivers ballistic performance comparable to 7.6239, yet possesses a base diameter that optimizes functionality in an AR-type platform. 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. A higher velocity will help a bullet fly with more power and speed, increasing how far a bullet can travel before gravity pulls it off its trajectory. You remind me of that writer who was a big fan of the .270 back in the Field and Stream days. 5. Let's find out! A longer barrel, because of its increased surface area, provides more room for cooling in instances where you shoot continuously. As for silencers, theres some competition out there. If you already have a favorite .300 Blackout barrel length and are in the market to buy one, check out our selection of premium .300 Blackout barrels. I was amazed at myself. Exactly what Int19h (?) Bullets make a similar noise, although not nearly as earth rumbling, that is very recognizable and isnt always advantageous in combat. COPYRIGHT 2021, THETRUTHABOUTGUNS.COM. 1:8 or increasingly, 1:7, especially if you want to stabilize subsonic, LONG bullets at low temperatures. The muzzle velocity used for 5.56 in the chart is with a 16 barrel, but the 300 BLK is using a 10 barrel. This gives more energy on target, a flatter trajectory and less wind drift. This compatibility means that it can allow for major savings if you're a gun enthusiast who likes to stay on a budget. The only thing that barrel length gets you is velocity the longer the bullet is in the barrel and being pushed by the expanding gasses of burning gunpowder, the faster that projectile will be going. Please tell us more about how awesome it is. Web920K views 3 years ago What barrel length is best for 300BLK AR-15s? In the chart, Hornady 110gr G-Max Full Boar (2,350 FPS At Muzzle), Hornady 125gr HP American Gunner (2,175 FPS At Muzzle), Hornady 190gr Sub-X Subsonic (1,050 FPS At Muzzle), *Competitive Shooter of the Week* I have two .300 BLK uppers from PSA. Compared to other bullets, a .300 Blackout is a 30-caliber bullet in a .223/5.56mm shell casing. For instance, the nine-inch barrel has a 100-inch drop at 410 meters, while a 16-inch barrel has a drop of a 100 inches at 440 meters. Factory Starline and SIG produced 300 HAMR cases are available, but cases can be made from common and available 5.56/.223 cases. We do not recommend choosing a shorter option because the barrel will not be long enough to sufficiently burn gunpowder and provide maximum force to propel the bullet from the muzzle. Another shilling advertisement for Faxon Firearms products. A big boom, and a really big flash, sounds like fun, when fun is the goal, anyway. They think its Fudd ammo. I was at first considering a 9" barrel with a 1:7 rifling, for that is what the cartridge was designed around. That coupled with your complaints is why. Products manufactured by 80% Arms carry a lifetime warranty against manufacturing defects. For a more economical build experience, getting a full lower build kit will save you some bucks. Using a short-barreled rifle is ideal for home defense as its compactness makes it easier to maneuver throughout the home. It gets pretty messy from there. The 300 AAC Blackout definitely works for hunters who want to use their AR15-platform rifle. One of the best things about 300 BLK is that it gets complete burn in a much shorter barrel. anyone have a good reliable source for ballistics of the most commonly commercially available and popular 300 blackout roundish relation to barrel length and rifling? For instance, longer barrels generate more bullet velocity. BA, Rosco, WC, and others have all worked immediately without any specialty tuning. Developed in 2009 by the Advanced Armament Corporation or AAC, the .300 Blackout is regarded as a round that gives top-class performance when compared to similar calibers. As an example my .243 Winchester LR308 based rifle is fine with IMR 7828 speed but Ramshot Magpro is just too violent with the rifle as configured. Realize that this gun is SPECIFICALLY designed for ultra close covert CQB use and is not concerned with supers and 100% powder burn. 125 and 225-gram .300 ammo fired from both barrel lengths can travel 100 yards without dropping. Though the .300 Blackout was designed to offer the best results in close-range targets, you can use it for long-range targets as well. With a 1-7 twist rate, for instance, it means that the bullet will be spun once over 7 inches of rifling. 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. We refer to it as one rotation over a particular inch of barrel. If you're looking for a multi-purpose load for the .300 AAC Blackout, this may be the best bullet. But all things considered, the .300 Blackout will surely deliver whenever it's put to the task. At Ballistic Advantage, we offer high-quality barrels for AR-style rifles, and you can find one with the perfect length to meet your handling and accuracy preferences. No one mentioned differences between polygonal rifling vs lands&grooves . Consider a rifle with a barrel 1000 yds long. I am always available for you. The. A 9 to 10-inch .300 Blackout barrel keeps a gun portable and short enough to wield easily. QA/QD systems may add more tolerance stacking and complexity, but the silencer is snug and firm. As always, train with your rifle and make sure you know your intended purpose before you buy. The 6.5 Grendel is a lower to mid-power 26 caliber cartridge. Affordable Factory 300 BLK Ammo is Available. Thats serious power up close, but that slow speed and heavyweight takes a toll at 500 yards. On the flip side SIG SAUER seems to think that 6 inches is perfect for them (their new MCX uses a 6-inch barrel). And yes, the .300 blk is designed to burn off in 9, but its not guaranteed that every round you could possibly put through it will do so. Let's find out! Would be really nice to be accurate (reliably hit 12x12 target at 200..maybe 250 yards?) In short, 9 inches is perfect for a 300 BLK barrel. will be fine. Whether youre hunting, defending your home, or just shooting suppressed at the range, 300 Blackout is a popular and adaptable cartridge. For you math types out there, a 30 dB reduction is enormous actually better than some earmuffs if the number is correct. Higher velocity results in less drop at longer ranges, which of course effects point of impact. Keep reading to discover the best barrel length for .300 Blackout for different shooting scenarios. What failed exactly? Save my name, email, and website in this browser for the next time I comment. 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. Although they share .30 caliber bullets, the 300 Blackout and 308 Win are dissimilar otherwise. The 300 Blackout would never see mainstream military use, although it became popular in the civilian shooter market. I think problems with any firearms are possible and the worst will show up on the internet (like snake and spider bites) because folks need help but its probably the exception not the rule! COPYRIGHT 2021, THETRUTHABOUTGUNS.COM. We refer to it as one rotation over a particular inch of barrel. The shorter a gun barrel, the more the gas expulsion at the muzzle equals a relatively louder sound every time you shoot. And of the couple dozen barrels Ive used in builds, only Faxons have given me fits with under-gassing (suspected out of spec gas port). The .300 AAC Blackout is designed as a variation of the older .300 Whisper ammunition. Supersonic ammo in a 10-inch barrel retains rifle caliber velocities but experiences greater bullet drop at distances. The odds are good enthusiasts will see diminishing, if any, return for running subsonic cartridges through 18-inch barrels or longer. So, I dont know, but its all very interesting to me. The muzzle velocity used for 5.56 in the chart is with a 16 barrel, but the 300 BLK is using a 10 barrel. 3. Jones design of .300 Whisper, gave it an ever so minor redesign, renamed it, and submitted it to SAAMI for certification. Mike: yes. 300 BLK was a way to achieve similar ballistics as the .308- with the least modifications to your 5.56. When you pair the barrel with .300 Blackout ammo, you get an easy-to-carry gun that spits rounds capable of penetrating heavy barriers. This ensures that the bullet maintains a more accurate and precise trajectory upon exit and improves the target-inaccuracy issue. At 10-inches, muzzle velocity hasnt reached its peak. 300BLK supers wont touch the 6.8SPC in a carbine length or longer barrel, and if you dont plan to suppress or run an SBR is just a way better choice. Heavy, slow moving subsonic bullets experience more bullet drop than fast, more aerodynamic bullets. They announced their current suppressor line at the 2013 shot show and we are now just starting to see them trickle into the retail channel. The stability provided by the long barrel will help the bullet fly on a flat trajectory and increase its likelihood of hitting its target. So would a better/different suppressor. WebIn matters of velocity comparison, different barrel lengths for the .300 Blackout sit within the 25-50 feet per second per barrel velocity rule that governs most firearms. You can blow up your gun and sustain serious injury. OUR GST-9 IS UNAFFECTED BY THE LATEST 12/28 ATF CLARIFICATION LETTER & SHIPS IN 3 DAYS! If youve ever noticed, experienced shooters allow their rifles to cool between shots, to avoid changes in POI. If you get too close to your prey, you may spook it, causing it to run off before you can shoot. Even though it is short, a 6-inch barrel can generate enough velocity to hit close-range targets. As for velocity gained with added barrel length (from loads not tailored for subsonic), Hornadys website FAQ explains there is no way to simply calculate gain or loss because due to variations in individual firearms, but on average, velocity gains or losses will be approximately 25 or 35 feet per second per inch of barrel differenceTo truly measure performance, the load should be tested over a chronograph.. 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. WebAt 200 yd (183 m), the 300 BLK drops 2 in (51 mm) lower than the 6.8 SPC, while it drops 30 in (760 mm) lower at 500 yd (457 m). So heavy a bullet conveys a subsonic muzzle velocity and correspondingly softer report. It could, if youre hand loading. Some folks wonder why consider a 300 BLK? Perfect for integral suppressor or just using as an SBR/pistol. Cartridge Overall Length: 2.02 inches. Granted, revolvers have a barrel / cylinder gap, but that is a separate issue. Longer barrels tend to be less rigid, so people go for bull barrels, but those get heavy so people go for fluted barrels. Though the muzzle rise and recoil forces are not entirely negligible, they are not enough to affect follow-up shots for the shooter. For 5.56 NATO, that point is 20 of barrel. Shorter barrels do not result in less accuracy. Im not sure if 18 or 20 or 24 would give the absolute greatest velocity, as I havent seen the specs on 300 BLK velocity in a 24 inch barrel. The point is, based on the design parameters of the 300BLK round while you do get more velocity from a longer barrel the % increased velocity per inch increase in barrel isnt as much as with say a 5.56. Ive soured on fast attach systems not least because the ratchet on my 762-SDN-6 gave out after three years and direct thread is the way to go. However, if you want to hit targets at over 100 yards, the best barrel length for .300 Blackout subsonic is 16 inches. Ive only ever seen youtube videos of it. Both AAC and Noveske use a 1:7 twist rate, while the PWS300 BLK upper uses a 1:8 twist. Great Barrel Life: With a .30-caliber bore and a modest powder charge, barrel life is outstanding. Mike: I cant seem to edit my comment. Saying things like at 10, the muzzle velocity hasnt yet reached its peak is misleading when youve got a cartridge with a wide swing of bullet weights and charge weights. Suppressor length is a grey area as it doesnt count as barrel length or open-air (something in-between, depending on internal geometry), but through testing you can predict how a specific suppressor affects your velocity. How to Assemble and Use the GST-9 Infinity Jig. The SAAMI diagram for the 300 BLK is shown below. One of those AI chatbots thats been in the news recently? The .300 BLK bullets are 0.30 inch in diameter (7.62 mm) and the .223 Rem (5.56 mm) is 0.224 inch. I do anticipate hunting deer / pig with this build supersonic of course.
