It fires a .30-caliber, 110 to 220-grain bullet and reliably works with and without a suppressor. Preparing for 300 BLK upper build and have further questions: I want to use ‘both’ sub and supersonic ammunition and am a reloader so leaning toward the 1/8 twist to take advantage of the calibures flexibility. The basis of their argument is that you want your rifle to have a barrel that’s just long enough for all of the gunpowder to burn, and no longer. As for waiting on Sig Suppressors – good luck with that. 300 Blackout.243 Win.224 Valkyrie.223 Wylde; 9MM; Barrel Blanks; BOLTS AND CARRIERS. The muzzle energy, which is the energy of a bullet just after it leaves the barrel of a gun. Chances are that looks like gobbledygook to you, so here are the key takeaways of the design: The bullet fired from the 300 Blackout typically weighs 110 to 220 grains (~7 to 14 grams), or two to four times as much as a 5.56 bullet. It is a niche gun not even available to the public. Its light weight and high speed also causes it to fragment, which is great for tearing up soft targets—like people—but not so great when trying to penetrate hard targets like wood. Plus higher velocity typically requires less hold over. You won’t find a cartridge that “does it all” better than the 300 Blackout. . Bullet trajectory is the path of a bullet as it makes its way to the target. 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. What if you prefer to hunt with subsonic 300 Blackout ammo fired through a suppressed rifle? As we’ve already covered, a well-designed subsonic bullet can be quite lethal, but it’s never going to cause as much damage as that same bullet moving at supersonic speed. The .300 AAC Blackout was developed specifically for the U.S. military’s M4 carbine by … 16" .300 Blackout CMV Barrel, Pistol Length - $189.99 Our 16" .300 Blackout Pistol Barrel is the perfect addition to your AR15 build. Terminal ballistics is the study of how the bullet behaves after it hits the target. For example, the absolute cheapest you can get 300 blackout is generally around 50 cents per round, so expect to play closer to 60 to 75 cents per round for your everyday practice ammo. Exactly what Int19h (?) In other words, if you were to shoot a 5.56 through a 9-inch barrel, it would have significantly less muzzle energy than the 300 Blackout. Once all of the powder in the case has been burned, there’s no more fuel to add to the combustion and the gasses are at their maximum energy. Close. about this and the "consensus" is 9". As a result, you generally want your home defense ammo to . Your second paragraph is spot on! Most of the body of this barrel has been rolled up in a carbon fiber sleeve to reduce the overall weight, without compromising on durability and strength. Since the .300 Blackout shares the same case head dimensions as the .223 Remington / 5.56mm NATO cartridge, it allows use of the same bolt carrier group and magazines as a standard M4/AR-15, making conversion as simple as swapping the barrel and muzzle device. Since the paperwork and tax didn’t kill you, and they already have your fingerprints, you’re gonna want to SBR it. That way, you can practice on the cheap while maintaining your skill with home defense cartridges. 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. AAC took the .300 Whisper, made slight modifications to the case and bullet to improve reliability, accuracy, and performance, and birthed the 300 Blackout (there’s more to this story, but that’s the long and short of it). One problem with many subsonic 300 Blackout cartridges is that they’re loaded with enough gunpowder to achieve maximum subsonic velocity—about 1,050 fps—out of a 16-inch barrel. So, I don’t know, but it’s all very interesting to me. For all intents and purposes, a good maximum range for supersonic 300 Blackout ammo is probably around 300 yards. For 300 AAC Blackout, that point is 9 inches of barrel. Unfortunately, reducing the speed of a bullet also significantly reduces its energy. But there you have it. . I want to use the 135 grain sierra varmiter in the 300 blackout. For example, you can’t increase the weight of a 5.56 bullet to more than about 70-grains before it starts causing problems. GLAD TO SEE YOU HERE. If you build an AR pistol, the 300 is the perfect round. Mission accomplished. It also singes the hair on my knuckles. So, if a 5.56 requires 20 inches of barrel to burn all of its powder, would it make sense to reduce the powder quantity when shooting a 5.56 through a 16 inch barrel (or even something much shorter like a 5.56 pistol)? Although they’re quieter, “subs” are also have significantly worse external and terminal ballistics and often don’t have enough energy to make the gun operate properly. Show . Velocities over my 9″ AAC barrel are surprisingly mild, about 30-40 FPS for subsonic and about 100 FPS for supersonics. Ed Play around with powders too much handloading and you screw up the timing on the gas system. At this point, you should use internal ballistic calculation tools to match your selected variable to the other. It could, if you’re hand loading. Frangible bullets are a little different. without overly sacrificing bullet performance and lethality . In 350 Legend vs 300 Blackout bullet energy, the 350 Legend gets another win. I’ve seen a few other suppressors suffer the same fate, for the same reason. Spending less than this will likely give you ammo that isn’t accurate enough, and spending more than that is likely overkill for competition and classes. This Ballistic Advantage 10” 300 Blackout AR Pistol Barrel Combines The Durability And Strength of 4150 Chrome Moly Vanadium Steel With The Extreme Corrosion Resistance of Salt Bath Nitride. Looks wild. While this makes sense at first glance, it’s not entirely accurate. I think you still have cut the barrel down if you want a shorter barrel. Most people train with cheaper ammo and then occasionally break out their fancy home-defense ammo to familiarize themselves with how it feels when shooting. Any time you put a can on a rifle, an adjustable gas block will allow you to tune it. 10 mph wind coming at a right angle from the side of the shooter, 0.3 ballistics coefficient (about average for 300 Blackout). That bullet is more blown open than a T-1000 after a run-in with Arnold Schwarzenegger. As for silencers, either wait for the SIG SAUER cans to come on the market or get yourself an AAC MG-SD. That’s water weight capacity. Out of stock. For 300 AAC Blackout, that point is 9 inches of barrel. Out of stock. I would recommend the Silencerco Saker 7.62 instead. These days, #1 on my list, especially for new silencer owners, is the Liberty Mystic-X. ... You have no items to compare. A cartridge load for 7 to 11-inch barrels with slightly more gunpowder to increase the velocity out of short-barreled rifles. It will be NINE inches in length. A bullet also travels less horizontal distances from wind when it is faster. Just looking over parts and realized I have some extras so you know what means! In many ways, this bullet has similar characteristics as the 5.56—it’s a light weight, extremely fast moving bullet with a lot of muzzle energy. If you live alone in a basement then this probably isn’t much of a concern, since bullets that overpenetrate will just lodge in your collection of anime sex dolls. Due to the fast burning powder inside the cartridge, there is no advantage to running an AR-15 .300 blackout barrel longer than 16-inches. dear sirs..just want you all to know how much, ..WAY DOWN DEEP IN THE PINEY WOODS WOOTEN. But shortening the guns usually has resulted in less accuracy. . Sorting Options. 8. A 9 inch barrel is definitely a handy length, but it is certainly not the fastest. You’ll also see bullet widths measured in millimeters (mm), and the width of the 300 Blackout bullet works out to 7.62 mm. A measurement of 130db is horrible. 300 blackout runs smoothly through 14.5 inches’ barrel of an M4, 24 inches’ rifle barrel and also 9 inches’ pistols barrel. And what are the external ballistics for subsonic 300 Blackout? Reader Pete writes: Hi Nick, I live in Amarillo and really enjoyed your article on your 300 BLK build. The last thing you ever want is a loosening silencer while shooting rapid fire or full auto. Subsonic ammo is lower-powered ammo that only propels bullets to just below the speed of sound. . Summary: The 300 Blackout is much better than the 5.56 at penetrating obstacles like rocks, walls, and trees, making it easier to hit targets hiding behind cover. This is not a function of the dimensional cartridge at a top level so much as it is a function of the SPECIFIC loaded cartridge you are using. So you recommended the harvester- the same can that BLEW OFF a rifle at TIFF and flew 40 yds into the berm. Why would you detach your suppressor for supersonic ammo? In order to make your rifle “Hollywood” quiet, you have to do two things: I’ll cover how suppressors work in another article. It’s more expensive ($1.4 most places), but it’s some of the most accurate subsonic 300 Blackout ammo you can find. Barrel, 300 Blackout . I know that’s a long discussion, but I’m primarily wanting close range tactics with a very short barrel (likely 9″). The copper base of the bullet is weakened in key spots so that when it’s forced to expand by the aluminum nose of the bullet, it flies apart into several sharp copper shards. I’m not sure if 18 or 20 or 24″ would give the absolute greatest velocity, as I haven’t seen the specs on 300 BLK velocity in a 24 inch barrel. Just search "optimal barrel length for 300 blackout" on Google and you will find plenty of forums, articles, etc. Subsonic 220Gr loading is 9.6Gr IMR 4227 and that is a near capacity load – I’d guess there is room for 11Gr. Even if all of the gunpowder has been burned, a longer barrel keeps the gasses contained and pushing on the bullet for longer, helping it reach higher velocities. I used the following data for these calculations: (Although these cartridges are slightly different, their stats are fairly representative of average 300 Blackout and 5.56/.223 ballistics.). Please tell us more about how awesome it is. Surf around on Internet forums, and you’ll often see people saying they would never use a 300 Blackout for home defense because it will overpenetrate. This Provides Long Barrel Life And Ensures Excellent Accuracy At An Affordable Price. Mike: yes. . Due to the bullet’s light weight, it’s able to reach a muzzle velocity of 2,800 fps—almost as fast as a 5.56 and much faster than standard 300 Blackout ammo. All else being equal, a bullet with a lower BC will slow down faster, whereas a bullet with a higher BC will maintain its velocity for longer. This high velocity gives the bullet a muzzle energy of 1,358 ft/lbs, which is also about three times higher than most subsonic 220-grain 300 Blackout ammo and almost the same as supersonic 115-grain 300 Blackout ammo. That is your shortest, lightest choice that will give you a tiny snap snap like a loud clap…around 119-121 db. Some people question whether or not the 300 Blackout is effective for killing deer, and the simple answer is, yes—absolutely. When combined with a suppressor, 300 Blackout ammo can give you one of the most powerful, nearly silent rifles you can have. All in all, it’s probably a better cartridge for killing deer than 5.56, so not only is it legal it’s also preferable. Would a shorter barrel make it quieter? Sig ONLY uses that 6.75″ (not 6″) barrel length for their Military full auto Black Mamba entry gun MCX. For you math types out there, a 30 dB reduction is enormous — actually better than some earmuffs if the number is correct. Not sure, and maybe I’m just splitting hairs. One for the M16 regardless of barrel length. I hope it will post. It was designed to burn in short barrels and anything more is really just excess weight. It should work reliably when using low-powered (subsonic) or high-powered (supersonic) ammo with or without a suppressor. AM-10 Lower Receiver Parts; AM-15 Lower Receiver Parts; AM-9 Lower Receiver Parts; AM Trigger Guard; AM Buffer Tube; UPPER RECEIVER PARTS. Drag also affects the bullet’s trajectory, which can have a significant impact on accuracy even at close ranges. I’ve loaded 5.56 for over 30 years. None of the metal fragments penetrated more than 16 inches, which is exactly what you want with home defense ammo. Three? I want to use it for deer hunting and I wonder if the added 1.5 inches will help. Since the .300 BLK is intended to function in much shorter barrels, it uses powders that are suited to burn in the shorter barrel lengths. 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