Factory Starline and SIG produced 300 HAMR cases are available, but cases can be made from common and available 5.56/.223 cases. A major benefit for me of using a 10 barrel on my blackout is that I can run a 9 or 10 handguard and still be able to use my can, that extra inch opens up a little bit more options in handguards. They first looked to the 7.6239 for inspiration. vs 300 Blackout (with ballistics charts For an MG with a sub 16 barrel and a suppressor, you only need two stamps, one for the suppressor and one for the MG. Two. 300BLK vs. 5.56? A 30BR pushes from 107 grains to 120 grain 30 cal projectiles. Every scrap of experience I have, and every bit of advice Ive ever been given (withthe exception of the black magic that is barrel harmonics), points to the conclusion that barrel length and accuracy have nothing whatsoever to do with each other. 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. Its the pressure of expanding gas behind the bullet that accelerates it, and it doesnt fall off at 9. Muzzle Velocity: 2,259 fps. Definitive Guide to 300 Blackout The .300 Whisper developed by J.D. For example, with a 10.5-inch barrel, the .300 Blackout clocks an average velocity of 2200 feet per second. I feel strangely compelled to visit faxon.com and view their lineup of 300 blackout barrel lengths. You would have to cut down and make your OWN 6.75 barrel since SIg will not sell you one of theirs. For example, if you shoot the same Hornady Sub-X 190-grain load from a 16-inch barrel, it will drop 33 inches at 200 yards a 14-inch improvement over shooting with a 10-inch barrel. said. The disadvantage with direct threading is that it will loosen up and start backing off while shooting. 300 AAC Blackout For varmint hunters, competitors and gun owners practicing at distance, supersonic .300 BLKs are big medicine. Scopes For Beginners: What is the Parallax Adjustment Knob and How Do I Use It? I just ordered a 16 inch barrel and stuck it on my Stag upper. Greater velocity, if the longer barrel enables such, leads to a farther maximum point blank range. 300BLK Barrel Length & All Things 300 Blackout Answered Sig ONLY uses that 6.75 (not 6) barrel length for their Military full auto Black Mamba entry gun MCX. Because the Blackout is wider, yet they tend to have similar weight, the Blackout has a lower Ballistic Coefficient than the 6.5 Grendel. I was at first considering a 9" barrel with a 1:7 rifling, for that is what the cartridge was designed around. Its an ad. The muzzle velocity used for 5.56 in the chart is with a 16 barrel, but the 300 BLK is using a 10 barrel. 300 AAC Blackout Ammo Review A bullet also travels less horizontal distances from wind when it is faster. After investigation, AAC found the 7.6239 cases aggressive taper too extreme for a standard M4 magazine to accommodate. To counter this, of course, there is always the option of sticking a silencer onto the muzzle. Twitter and other social media icons below. Bullets make a similar noise, although not nearly as earth rumbling, that is very recognizable and isnt always advantageous in combat. WebThe 300-Blackout is a lower-power 30-caliber cartridge. It probably worked loose after multiple shots, and somebody forgot to tighten it back up. So, I dont know, but its all very interesting to me. Since the paperwork and tax didnt kill you, and they already have your fingerprints, youre gonna want to SBR it. The LAST thing you want is a wobbly bullet going through your expensive muffler, not quite behaving itself. Ive seen a few other suppressors suffer the same fate, for the same reason. https://en.wikipedia.org/wiki/.300_Whisper. The SAAMI diagram for the 300 BLK is shown below. 300 BLK is the perfect round to suppress. Thats 8 inches of barrel for the 300 BLK 1-8. 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. Factory Starline and SIG produced 300 HAMR cases are available, but cases can be made from common and available 5.56/.223 cases. In a tactical situation, I can see the reason for keeping it attached, but at the range, supersonic ammo is not going to be ear safe with or without a suppressor. Longer barrels can be more accurate when using fixed sights, because a longer sight radius allows for finer adjustment of aim. Although functionally identical to the 300 Whisper, the 300 AAC Blackout is its own SAAMI standardized cartridge. Only specific barrel and ammo testing will tell, though. Web920K views 3 years ago What barrel length is best for 300BLK AR-15s? Gun Review: Henry U.S. What is Foghorns opinion of the Gemtech GMT-300BLK as a suppressor for a .300 BLK? A whole new world of hunting and target-shooting options open with that difference, a fact sometimes obscured by the cartridges subsonic and military roots. BBTI - Ballistics by the Inch :: Home The 300 AAC Blackout delivers ballistic performance comparable to 7.6239, yet possesses a base diameter that optimizes functionality in an AR-type platform. The companies didnt start completely from scratch, 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. Long .300 Blackout barrels have a tighter twist rate, which helps maintain a high velocity and accuracy when shooting a heavy bullet. 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). That typically occurs in much longer barrels that are commonly in use. 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. For Pete this isnt ideal, but for the average person this would be a good option. If youve ever noticed, experienced shooters allow their rifles to cool between shots, to avoid changes in POI. Especially since there are some lightweight 308 ARs out there now. Buy a .308 from a legit company and save yourself headaches. Though there is a lot of talk among gun enthusiasts about the nine-inch sweet spot of barrel length when it comes to the .300 Blackout, the ammo works well with different variations of barrel lengths and uppers. Its a few hundred FPS from my 16 AR9. For the best experience on our site, be sure to turn on Javascript in your browser. I know thats a long discussion, but Im primarily wanting close range tactics with a very short barrel (likely 9). Three? ), while others may be better in 8 or 10 barrels. Exactly what Int19h (?) 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. They term best is entirely subjective and influenced by intended purpose and individual needs. 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? 300 AAC Blackout I reckon most of us can read between the lines on that. 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). Subsonic .300 Blackout rounds fix this problem by traveling slower than the speed of sound. Maybe not so much that the longer barrel is directly responsible for greater accuracy, but indirectly? However, if you want the best barrel length for .300 Blackout home defense, we recommend not going shorter than 6 to 8 inches. I strongly suspect thats where this comes from. I dont know how the 30BR compares powder quantity wise to the 300 BLK, but that could account for the difference in barrel length. 300 Blackout 1-7 vs Heavy grain subsonic bullets are barely able to retain true subsonic performance. When you pair the barrel with .300 Blackout ammo, you get an easy-to-carry gun that spits rounds capable of penetrating heavy barriers. My friend bought a 300 Blackout upper from PSA and put a can on it. This issue isnt unique to 300 Blackout bullets, though. Even the bolt stays the same, and all that changes is the barrel. CLICK HERE for more information. What happened was the Sig Brace. It also has a great barrel life, which means it can go for long periods and operate effectively under varying conditions. And it also serves as a specialized 30-Cal rule-beater that lets 3-Gun competitors make major with a low-recoil cartridge that also offers long barrel life. Versions include FMJ, with or without boattails, open tip match or open tip flat base and cartridges with Hornadys SST V-Max, Sub-X or hollow points. The 300 Blackout is frequently available with 200 and 220 grain bullets. I would look into making/getting a telescopic suppressor (reflex design). 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. Any discussion on the effective range is a minefield full of opinion best tiptoed over by indicating those figures make the .300 BLK at 300-yard shot territory most comfortable for veteran shooters. We will promptly replace or repair any product that we determine to be defective. I make my living building high end audio equipment, I cant afford ear damage. We refer to it as one rotation over a particular inch of barrel. And thanks to the mounting system, you can get multiple end caps to thread it on everything from 1/2 x 28 threaded barrels to H&K 3-lug mounts with a few seconds of twisting. vs 300 Blackout (with ballistics charts . The .300 BLK bullets are 0.30 inch in diameter (7.62 mm) and the .223 Rem (5.56 mm) is 0.224 inch. John McClain, *Competitive Shooter of the Week* Copyright Ammotogo.com 2023 All Rights Reserved. It could, if youre hand loading. Consider a cartridge that has enough energy to travel 1000 yds in free air, standard conditions. 300 Blackout The .300 Blackout barrel delivers firepower and accuracy comparable to longer barrels. 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? The 300 Blackouts sleeker bullet has a higher. Easy Conversion: Use your current AR lower, bolt/carrier, buffer, and magazine. I came here for a clue about what barrel to get for a pistol build, but I know once I have it Im going to want a real stock and a suppressor. For 5.56 NATO, that point is 20 of barrel. The shorter a gun barrel, the more the gas expulsion at the muzzle equals a relatively louder sound every time you shoot. Sound travels at 1,100 fps at sea level on a standard day. SOCOM 7.62 Mini suppressor. Heck, my Walmart still sells .308 after the evil 5.56 and handgun ammo purge. The deer Ive taken with my 8 300 BO dont know or care. Most bullets from both cartridges weigh around 125-Grains. At 300, holdover is only 23.4 inches. This was years ago and PSA was no help at all. Hey, man. Handloading the .300 AAC Blackout I get a rifle firing sound which seems down range. At this point, frictional (and other opposing) forces will start to DECREASE velocity. In short, barrel length arguments or advice are pretty worthless in comparison to having actual mathematical data and testing. 300 Blackout WAS stolen from 300 Whisper. 9 models V Seven 300 AAC Blackout Stainless Match Barrel (8) As Low As (Save Up to $10.00) $359.99 Best Rated. However, a longer barrel will lead to a weightier gun, and you may have trouble wielding it with one hand. In my ignorance, I would say its because I want to reduce wear and tear on the suppressor. You have entered an incorrect email address! 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? However, even worse for accuracy is the projectile slowing from supersonic to subsonic velocity. 300 Blackout 1-7 vs Perfect for integral suppressor or just using as an SBR/pistol. In large part because of PSAKs being very dangerous garbage until very recently. They straight stole J.D. 300BLK vs. 5.56? I think you still have cut the barrel down if you want a shorter barrel. 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. 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. A faster bullet requires a different twist to stabilize I think, and if the twist is too fast the bullet will sail like a kite instead of soaring, but its true the faster bullet will be flatter trajectory, and flatter can feel like accuracy for most people who dont want to adjust for elevation. It didnt take long for engineers at two of the industrys finest to solve the problem, though. The accuracy of a .300 Blackout barrel will depend on the exact round and barrel length you use. It is much less sensitive to muzzle velocity loss through short barrels than the 5.56. And adding a foot-long can to a full-length rifle is not optimal, particularly when you can push a 220 grain bullet to just under the speed of sound in six inches or so. 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. 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. Let's find out! It too functions with all loads I have. Most AR-15 upper 300 Blackout rifles feature the 1:7 and 1:8 twist rate, which is the rifle barrels spin rate. For example, with a 10.5-inch barrel, the .300 Blackout clocks an average velocity of 2200 feet per second. Let your fellow shooters know share this article using the Facebook, The .300 BLK bullets are 0.30 inch in diameter (7.62 mm) and the .223 Rem (5.56 mm) is 0.224 inch. There its drop is more than 30 feet (with a 100-yard zero) and energy drops to 309 foot-pounds. They can run any barrel length without an additional stamp. 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). Great! The only real question is what twist rate to go with. 300BLK vs. 7.62x39? Another reason why 9 to 10 inches is the best overall .300 Blackout barrel length is the minimal muzzle rise and comfortable recoil. This means the .300 Blackout is more effective at long distances. 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. The .44 Mag is well known for picking up considerable velocity from a carbine. This is actually much tighter twist required to stabilize the short 124gn. I hope it will post. (function() { This means that one gun can serve as two just by switching the uppers. Sorry to be bearer of bad news. If it's inside your house in home-defense scenarios, a short barrel will allow for better maneuverability. This adaptability to the existing rifle specifications was made possible by the fact that the designers and engineers chose not to go down the path of building up from scratch. For 300 AAC Blackout, that point is 9 inches of barrel. 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. 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. They are as dishonest as BBB/Angies List/etc. COPYRIGHT 2021, THETRUTHABOUTGUNS.COM. But if the amount of gunpowder to be burned is held constant, the length starts becoming a drawback. 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. Not all 7.62 cans are as effective, my Ti-Rant 9 suppresses subsonic 300BLK better (subjectively) than the 762-SDN-6. The reduced recoil and muzzle rise make taking accurate follow-up shots much easier. Speared on by no issues I built a 10.5 inch pistol with an arm brace LOL. The length of a barrel also dictates the rifle's twist rate and thus the bullet as it travels down the barrel. With supersonic rounds for maximum muzzle velocity to subsonic loads that quiet the roar by slowing the pace. 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.
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