With a warm barrel/suppressor unit, it is possible to shoot impressive groups. Really -- the largest difference is barrel length. Your second paragraph is spot on! 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. despite the short barrel. The old 55 grain ammo used the 1:9 twist , the new 63 grain uses the 1:7 twist heavier bullets need more spin to stabilize and the tighter twist actually increase velocity by increasing dwell time. We are not only talking about powder burn, but the pressure created by the expanding gasses of the powder. A 16-inch barrel ensures complete gunpowder burning to fire rounds with maximum force. It was designed to burn in short barrels and anything more is really just excess weight. A 1:8 twist works best with the light-weight supersonic rounds.
300 Blackout Ballistics The Harvester is a great suppressor. As always, train with your rifle and make sure you know your intended purpose before you buy. Converting an AR-15 to fire 300 Blackout is as simple as swapping its barrel. With supersonic rounds for maximum muzzle velocity to subsonic loads that quiet the roar by slowing the pace. However, heat build up effects point of impact. For optimal performance with a suppressed 300 Blackout, we recommend a barrel length of 8-10. There arelots ofbetter options that have come on to the market in the last few years, and the 762-SDN-6 just hasnt held up to the newer competition. Nicole Krenze, *Competitive Shooter of the Week* creates and publishes industry standards for safety, interchangeability, reliability and quality, as well as coordinates technical data for agencies, enthusiasts and manufacturers. Because the Blackout is wider, yet they tend to have similar weight, the Blackout has a lower Ballistic Coefficient than the 6.5 Grendel. Hi Lance, well I thought like you did, stick it on and go but being a dumb old guy I did not bother to research much. Web5 models Noveske Lo-Pro Gas Block 300 AAC Blackout Barrel (1) As Low As (Save Up to 14%) $351.50 Final Sale. What happened to it will fire from any AR-15 you might have doesnt appear to be the case since now you say a 9 barrel is optimal but which would require an SBR $200 stamp, you may need an adjustable gas block to handle over gassing & shoot subsonic and then theres the ammo is twice the cost what I pay for my 556 rounds.. My interest in building a 300 AAC for hog hunting that I could just slap in my upper is quickly deteriorating, especially since the gun may not even cycle without, additional hardware if you want to what was promised, which is shoot both supersonic and supersonic through a stock 16 barrel. Wondering if you know if theres a significant advantage in range with a 10.5 (both sub and super-sonic). Currently they offer a 16 300 Blackout barrel for their MCX. 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. Damn was my arm sore on the 7th day, so I rested . FWIW. Not on my 300 blk.
300 Blackout John McClain, *Competitive Shooter of the Week* 300BLK vs. 7.62x39? The stiffer barrel damps harmonics. The latter will stop the bullet long before it exits the barrel due to the additional forces of friction opposing opposing the bullets forward movement. Sig does plan for a civilian 300 barrel. After investigation, AAC found the 7.6239 cases aggressive taper too extreme for a standard M4 magazine to accommodate. Web5 models Noveske Lo-Pro Gas Block 300 AAC Blackout Barrel (1) As Low As (Save Up to 14%) $351.50 Final Sale. Everything from .22lr to subsonic .308 Winchester, and even 5.56 NATO from a 16 barrel. Compared to other ammunition like the 350 Legend, the .300 AAC Blackout is more effective in taking long-range shots. Affordable Factory 300 BLK Ammo is Available. ALL RIGHTS RESERVED. 300 BLK was a way to achieve similar ballistics as the .308- with the least modifications to your 5.56. So heavy a bullet conveys a subsonic muzzle velocity and correspondingly softer report. There is no real difference in muzzle blast from either, both rifles use identical Surefire brakes. Hope this helps. . 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. All you need is a bigger diameter barrel. The 6.5 Grendel is a lower to mid-power 26 caliber cartridge. Best Barrel Length For Suppressed 300 Blackout For optimal performance with a suppressed 300 Blackout, we recommend a barrel length of 8-10. BA, Rosco, WC, and others have all worked immediately without any specialty tuning. Shorter barrels do not result in less accuracy. Such large projectiles convey a subsonic muzzle velocity that is accompanied by a quiet report. Thats 8 inches of barrel for the 300 BLK 1-8. If the .300 BLK is good enough for the U.K. and U.S. military, its more than enough for home defense. The shorter a gun barrel, the more the gas expulsion at the muzzle equals a relatively louder sound every time you shoot. I need to get the lathe going as well, and I havent had the time or patience to do it. Let your fellow shooters know share this article using the Facebook, Long .300 Blackout barrels have a tighter twist rate, which helps maintain a high velocity and accuracy when shooting a heavy bullet. Sound travels at 1,100 fps at sea level on a standard day. In a 16 supersonic only AR there are vastly superior caliber choices like 6.8SPC. Supersonic bullets travel fast enough to generate sonic booms, and the resulting noise gives even suppressed gunshots a loud "crack.". Best of both worlds. 21.5Gr shows pressure signs. But barrel length can significantly impact your firearms performance. agreed on this. Please tell us more about how awesome it is. So would a better/different suppressor. The concept of putting a .30-caliber bullet in a shortened 223 case has been done before, but not as an industry-wide standard that anyone can make products for, royalty-free. The kissing cousins resemble twins at a distance, but the similarities end at projectile girth. . And cheaper to boot. And if you are out in the wild shooting at some long-range game, a longer barrel will give you both the power and accuracy advantage. said. If your barrel is 8 to 10 inches, attaching a 6-inch suppressor will take the barrels length to 14 to 16-inches. Personally, if I had to do it all over again, I would definitely not go with a 762-SDN-6. 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. I would recommend the Silencerco Saker 7.62 instead. 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. The .300 AAC Blackout is designed as a variation of the older .300 Whisper ammunition. And using the 5.56 casing and same length round (from casing base to bullet tip) means they can use 5.56 magazines with no capacity loss. 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. They are flatter shooting and, with less time in flight, less prone to the effects of wind. Now its a chicken and egg thing. With or without the can. Part of todays confusion over 300 Blackout effective range and barrel length often stems from this flavor.
300 Blackout 1-7 vs The 300 Blackout is frequently available with 200 and 220 grain bullets. Avoiding the logistical nightmare that would have been to replace the military's standard issue rifle during an ongoing war, the .300 Blackout was designed to be compatible with the M4 system. Lighter, 125gn bullets wont care, but long, slow bullets need FAST spin-rates. Really -- the largest difference is barrel length. Its an ad. The .300 Blackout barrel delivers firepower and accuracy comparable to longer barrels. The length of a barrel also dictates the rifle's twist rate and thus the bullet as it travels down the barrel. 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). While you can have a 9-inch .300 BLK barrel pistol, the best barrel length for .300 Blackout pistol is 6 inches. A buddy has a 100yd range in his back yard. If youre looking for the quietest and best handling setup, you could easily go as short as 7.5, which is offered by makers like Faxon Firearms and others. Part of that equation is the use of subsonic loads with heavy bullets and powder that burns completely in that abbreviated barrel. I strongly suspect thats where this comes from. Keep reading to discover the best barrel length for .300 Blackout for different shooting scenarios. The SAAMI diagram for the 300 BLK is shown below. I also note that this info is hard to find anywhere else, boiled down to what works, for the average guy based on a lot of industry insider info- and trying different things, and that is all you, Nick, and TTAG. The disadvantage with direct threading is that it will loosen up and start backing off while shooting. They designed it for the needs of Special Forces to be real compact (as an Mp-5) and QUIETER than an MP-5. Since its suppressed, the other deer in the area dont seem to mind either.. We also offer our patented AR-15 and .308 Easy Jigs which is the first 80% lower jig that makes it ridiculously easy for a non-machinist to finish their 80% lower in under 1 hour with no drill press required. 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 . if you do want to talk, you can come to me. 4 models Rainier Arms AR Ultramatch MOD2 300BLK Barrel $400.00 Final Sale. TKS! 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. I recommend the Silencerco Omega FTW.
Two Colt M16s? With a 1-7 twist rate, for instance, it means that the bullet will be spun once over 7 inches of rifling. Out of a cold unit, you will always have a flyer, usually the first shot. Dennis- 300 BLK starts with a 5.56 casing that they neck down much shorter, allowing for a wider and longer bullet that can now weigh significantly more than any 5.56 can. What's the Best Barrel Length for .300 Blackout? The question that Ive always asked when I look at this is is why hasnt someone figured out one can just as easily make a modern set of 125gr and 220gr 7.6239s and blow away the .300 BLK at its own game? Gun Review: Henry U.S.
300 Blackout Dont forget that longer barrel = greater sight distance for iron sights. A successful hunt requires sneaking up on a target until you're close enough to take a clean and fatal shot. I think you still have cut the barrel down if you want a shorter barrel. Its not going to be long until you want to suppress it and/or SBR it. Exactly what Int19h (?) In short, 9 inches is perfect for a 300 BLK barrel.
BBTI - Ballistics by the Inch :: Home 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.
Most bullets from both cartridges weigh around 125-Grains.
300 Blackout Barrels Its the pressure of expanding gas behind the bullet that accelerates it, and it doesnt fall off at 9. Why would you detach your suppressor for supersonic ammo? A more rigid barrel is better. Plus, the long barrel compensates for its rather laborious maneuverability. In large part because of PSAKs being very dangerous garbage until very recently. 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. By design, the 300BLK just doesnt give up that much velocity until you get down below 9-10 of barrel using factory ammo. WebThe 300 HAMR 1-11.25, 1-13, or 1-15 twist match grade barrels are optimized for accuracy with 95gr to 150gr bullets from 8 to 20 barrel lengths. How to Assemble and Use the GST-9 Infinity Jig. So many thanks for your article and any advice you can give. 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. Velocities over my 9 AAC barrel are surprisingly mild, about 30-40 FPS for subsonic and about 100 FPS for supersonics. Drop is predictable; wobble is not. (function() {
COPYRIGHT 2021, THETRUTHABOUTGUNS.COM. I wonder, though, whether people ascribe greater accuracy to a longer barrel, thinking longer barrel = straighter trajectory, when really its that longer barrel = greater velocity, which in turn implies less susceptibility to random wind movements? The SAAMI diagram for the 300 BLK is shown below. My friend bought a 300 Blackout upper from PSA and put a can on it. AAC .300 BLK AR-15, The Gun Blog. or youll solve them. 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. 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* To counter this, of course, there is always the option of sticking a silencer onto the muzzle. I tried 220g subsonic, but the boing of the buffer spring was annoying enough to prompt me to upgrade to stainless and stick with the supersonics. This is because most operators commend the high stopping power of the 300 Blackout in close-combat engagements compared to other ammunition issues. The article is a little wordy but does a decent job of explaining that the best barrel length depends on what optimal performance means to you. 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. The more we all know, the better organized and stronger the shooting and hunting community will be. Using a short-barreled rifle is ideal for home defense as its compactness makes it easier to maneuver throughout the home. The 16-inch barrel also delivers greater energy on impact regardless of the ammo type. Able to suppress all rifle calibers up to and including 300 Winchester Magnum, its perfectly at home on the 300 BLK rifle offering about 40% sound reduction. PWS is as close as you can get right now. Like you stated, as long as there is more pressure pushing the bullet forward than barrel friction retarding it, the bullet will continue to accelerate. Muzzle Velocity: 2,259 fps. While the 300 BLK is easy (and inexpensive) to reload, Remington and AAC recognized that most people are not reloaders.
300 Blackout Effective Range & Best Barrel Length There were also efforts to introduce the AK-friendly 7.6239 mm (also .30-caliber) to modern sporting rifles, but many of them ran into the cartridges case geometry challenge, where feeding can become a concern. Here are the key reasons you may want to acquire a 300 AAC Blackout upper for your AR: 1. In short, barrel length arguments or advice are pretty worthless in comparison to having actual mathematical data and testing. The barrel should also deliver enough bullet velocity to hit far-off prey with deadly impact. Realize that this gun is SPECIFICALLY designed for ultra close covert CQB use and is not concerned with supers and 100% powder burn. I screwed my walking dead, LEGAL, form 1 Maglite silencer on it. Heavy grain subsonic bullets are barely able to retain true subsonic performance. 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. Would be really nice to be accurate (reliably hit 12x12 target at 200..maybe 250 yards?) Looks wild. (That was a mistake Ill rectify next barrel probably.). Cartridge Overall Length: 2.02 inches. Factory Starline and SIG produced 300 HAMR cases are available, but cases can be made from common and available 5.56/.223 cases. Since the paperwork and tax didnt kill you, and they already have your fingerprints, youre gonna want to SBR it. I just ordered a 16 inch barrel and stuck it on my Stag upper. For 300 AAC Blackout, that point is 9 inches of barrel. By and large, the relatively rapid loss of velocity confines the 300 Blackout to near medium and close ranges. Mine has a 10. Compared to other bullets, a .300 Blackout is a 30-caliber bullet in a .223/5.56mm shell casing. Higher velocity results in less drop at longer ranges, which of course effects point of impact. Really -- the largest difference is barrel length. The development of the .300 Blackout was a joint effort between AAC and Remington Defense, and this was to produce a replacement for the 5.56 NATO. The 220 grain subsonic .300 Blackout goes at about 1010 feet per second with 500 foot-pounds of muzzle energy. My .308 and my 300 BLK are both capable of pushing the same size bullet, but the .308 has way more space in the case for powder than does the 300 BLK. Designed specifically for 300BLK and 7.6239, rated for .308 WIN in 16 or longer barrels. How is the recoil of the 6.8 vs 300 Blackout? So, dont read to much into the issues. Subsonic 220Gr loading is 9.6Gr IMR 4227 and that is a near capacity load Id guess there is room for 11Gr. The 115 gr (7.5 g) 6.8-round has a higher muzzle energy of 1,694 ftlb (2,297 J) due to its greater velocity, while the 125 gr (8.1 g) 300 BLK round has a muzzle energy of 1,360 ftlb (1,840 J). 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. 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. For example, with a 10.5-inch barrel, the .300 Blackout clocks an average velocity of 2200 feet per second. This issue isnt unique to 300 Blackout bullets, though. Nothing further than that is as effective since the gunpowder burning would be inefficient in the spare room. 9 models V Seven 300 AAC Blackout Stainless Match Barrel (8) As Low As (Save Up to $10.00) $359.99 Best Rated. Stay tuned, because we will have more information on them as soon as that information becomes available. 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. If you didnt before, you can now easily see there are many factors to consider when selecting the best barrel length for your .300 BLK rifle and determine the effective range of the caliber. AAC didnt develop a damned thing. The companies didnt start completely from scratch, though. For 300 AAC Blackout, that point is 9 inches of barrel.
300 blackout Scopes For Beginners: What is the Parallax Adjustment Knob and How Do I Use It? Supersonic ammo retains rifle caliber velocities, has increased effective distance, and bullet drop is greatly reduced. This isnt that hard. Also, the 300 BLK shoots faster from a 16 barrel than a 9 barrel, particularly with supersonic loads.
300 Blackout Effective Range & Best Barrel Length Good follow up to your other posts on 300 black. Not all 7.62 cans are as effective, my Ti-Rant 9 suppresses subsonic 300BLK better (subjectively) than the 762-SDN-6.