1) Barrel length? However, the 300 Blackouts heavier bullet compensates for its lesser speed to grant it an effective muzzle energy, and its 0.84 greater diameter enables it to inflict a wider wound channel. Matt Gomes -, We've updated our Garand Thumb post to include vid, Sporting Arms and Ammunition Manufacturers Institute, Understanding Different 12-Gauge Shotgun Load Types, 300 Blackout Effective Range & Best Barrel Length, Survival & Backpacking Water Filter Tests, Best 9mm Ammo: Plinking, Training & Home Defense. Although the 300 Blackouts effective range depends on the shooter and application, the chart above provides rough guidelines for consideration. So heavy a bullet conveys a subsonic muzzle velocity and correspondingly softer report. While I can see Nicks point in preferring screw on suppressors over fast attach systems, there are reasons why the fast attach is superior in some cases. A 20 inch barrel will not hinder you with your AAC. For .22LR, for instance, the optimum length is 16. Since its suppressed, the other deer in the area dont seem to mind either.. Even though it is short, a 6-inch barrel can generate enough velocity to hit close-range targets. I have two .300 BLK uppers from PSA. For long-range targets, barrel lengths of up to 16 inches are available. That did more to spark interest in NFA items than anything. With a 1-7 twist rate, for instance, it means that the bullet will be spun once over 7 inches of rifling. Factory Starline and SIG produced 300 HAMR cases are available, but cases can be made from common and available 5.56/.223 cases. Supersonic ammo retains rifle caliber velocities, has increased effective distance, and bullet drop is greatly reduced. Longer barrels tend to be less rigid, so people go for bull barrels, but those get heavy so people go for fluted barrels. A lighter gun via barrel would allow more other things to be used. How is the recoil of the 6.8 vs 300 Blackout? By design, the 300BLK just doesnt give up that much velocity until you get down below 9-10 of barrel using factory ammo. 300 Blackout SAAMI Cartridge Specification. I dont know much about ballistics, but wouldnt the higher velocity associated with a longer barrel mean less bullet drop over longer distances, thus increasing accuracy? The distinction means the round can fit into an AR magazine, an AR upper built for the .300 Blackout, and an AR lower. I took that pistol with 220 grain ELD-X over 10.6 grains of AA 1680 And hit the 19 plate the second shot with the red dot! Wilson Combat 11.3 barrel (worried this is too long) The accuracy of a .300 Blackout barrel will depend on the exact round and barrel length you use. The kissing cousins resemble twins at a distance, but the similarities end at projectile girth. 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. 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. The article is filled with generic statements we all knew in 2009, and some incorrect statements that conflict with the dozens of articles TTAG has posted in the past on 300BLK; look uo Leghorns articles on 300BLK for good data. 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. As a result, heavy-grain subsonic bullets struggle to retain their subsonic terminal performance, while supersonic ammo has increased effective range and reduced bullet drop. One of the best things about 300 BLK is that it gets complete burn in a much shorter barrel. A 5.56 and a .308 will do everything you need it to do. If you look up brown recluse or rattlesnake bites on the internet youll be scared shitless from the images. Would be really nice to be accurate (reliably hit 12x12 target at 200..maybe 250 yards?) A long barrel also provides the runway a bullet needs to stabilize fully before exiting the muzzle. 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. 80% Arms sells AR-15 and .308 80% Lower Receivers, 80% Lower Jigs and other accessories which allow you to legally build a firearm at home in most states. It depends on the intended purpose of the rifle. Military manufacturers will still load for 20, because they have to accommodate the M4, M16, M249, etc. Heavy, slow moving subsonic bullets experience more bullet drop than fast, more aerodynamic bullets. I have a Q Honey Badger Barrel Assembly which is 7 and a Q Trash Panda. Nicole Krenze, *Competitive Shooter of the Week* We refer to it as one rotation over a particular inch of barrel. Lantac or Gemtech BCG (want to ensure proper cycle) ), while others may be better in 8 or 10 barrels. (AAC) or have you seen / heard of any better? Because the Blackout is wider, yet they tend to have similar weight, the Blackout has a lower Ballistic Coefficient than the 6.5 Grendel. However, even worse for accuracy is the projectile slowing from supersonic to subsonic velocity. For example, with a 10.5-inch barrel, the .300 Blackout clocks an average velocity of 2200 feet per second. The best option is one that youre not going to like: wait. However, this maximum effective length is determined by the barrel's length, and the 460-meter distance is achieved by a nine-inch barrel. Regardless of the position it plays, the .300 BLKs performance often hinges on finding the best barrel length and load combination for the distance you have in mind. Ive only ever seen youtube videos of it. 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. 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. For those with suppressors, the 1:7 twist favors the heavier subsonic rounds. Much better QD system than AAC, and with the replaceable mounts, you can even go direct thread if you want. Though its a common report that subsonic ammo isnt remarkably accurate for most users, Ive been very pleased with my Remington 700s performance with 208 AMaxs. This gives more energy on target, a flatter trajectory and less wind drift. I think you still have cut the barrel down if you want a shorter barrel. Hope this helps. Daniel Squ, Brass-cased ammo generally outpaces steel in every, *Competitive Shooter of the Week* On the downside, the weight of these bullets prevents them from traveling far and maintaining a flat trajectory. 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). I assume that there is a finite lifespan of the suppressor guts and shooting supersonic ammo at the range kind of defeats part of the suppressor benefit. Although functionally identical to the 300 Whisper, the 300 AAC Blackout is its own SAAMI standardized cartridge. Thats the one, and only reason Im so anal about checking mine on the range, or in the field. 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. So heavy a bullet conveys a subsonic muzzle velocity and correspondingly softer report. Ed In a 16-inch barrel, .300 Blackout ammunition gets impressive velocity and accuracy, allowing you to hit targets over 150 yards away. Have been shooting 300 for a few years now. (function() { ps.the arm brace apparently was deemed legal by ATF for incidental resting on your shoulder. 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. Cartridge Overall Length: 2.02 inches. Supersonic bullets travel fast enough to generate sonic booms, and the resulting noise gives even suppressed gunshots a loud "crack.". The shorter a gun barrel, the more the gas expulsion at the muzzle equals a relatively louder sound every time you shoot. Once all of the powder in the case has been burned, theres no more fuel to add to the combustion and the gasses are at their maximum energy. .the same content appeared at breachbangclear.com about a week ago, they dont attach a name to it either. By and large, the relatively rapid loss of velocity confines the 300 Blackout to near medium and close ranges. They first looked to the 7.6239 for inspiration. Hey Nick. I dont think you can get there in 9 inches with full-size powder loads regardless of how fast-burning they are. _gaq.push(['_trackPageview']); At 300, holdover is only 23.4 inches. Now the ammo costs too much for a niche rifle caliber. 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! When picking out a muzzle for your assembly, keep in mind the muzzle's compatibility with available suppressor fittings. ALL RIGHTS RESERVED. What failed exactly? If you are shooting only subs, then even something as short as the Sig Rattlers 5.5 barrel (less than 3.25 of rifling!) *Calculations are estimates using Hornadys on-line ballistic calculator and adjusted by the companys estimate of between 25 and 35 fps loss per inch of shortened barrel length (30 fps subtracted per inch for the purposes of this chart). Also, always, always check your .223 magazines to ensure no 300 BLK rounds worked their way in when you loaded the mags. Getting away with it because they had deeper pockets (costs a lot to get SAAMI cert) and Remington Defense backing. Would a shorter barrel make it quieter? Sig does plan for a civilian 300 barrel. Even so, 1:7 isnt terrible. Factory Starline and SIG produced 300 HAMR cases are available, but cases can be made from common and available 5.56/.223 cases. We refer to it as one rotation over a particular inch of barrel. Just a tiny bit louder but shorter and lighter is the versatile Silencerco Omega. Now its a chicken and egg thing. No one mentioned differences between polygonal rifling vs lands&grooves . I have a Sig red dot on my 556 upper and a 4-1240 Bushnell scope on my 300. For you math types out there, a 30 dB reduction is enormous actually better than some earmuffs if the number is correct. Appreciate so much your sharing of experience so that I dont have to go through all the same trial and error. The 220 grain subsonic .300 Blackout goes at about 1010 feet per second with 500 foot-pounds of muzzle energy. 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. var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s); The extra speed can be so great as to cause bullet failure. But what really makes me love it is the wide variety of calibers it can be used on. Burn rates mean more than amount of powder in your cartridge. A more rigid barrel is better. Two Colt M16s? Stay in touch with Widener's, be the first to know about new articles, products, and more. 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. 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. Converting an AR-15 to fire 300 Blackout is as simple as swapping its barrel. Plus, the long barrel compensates for its rather laborious maneuverability. Keep in mind, the odds are good that powder mix completely burns in that 16 inches of test barrel. Currently they offer a 16 300 Blackout barrel for their MCX. This guide takes a closer look at the various barrel lengths for the 300 Blackout round and where to find them. The well-known terminal performance of that Sub-X bullet, however, does make the load an ear-friendly option for some who hunt at relatively short distances. 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. Scroll right to see energy, drop and coefficient data. For the best experience on our site, be sure to turn on Javascript in your browser. If the .300 BLK is good enough for the U.K. and U.S. military, its more than enough for home defense. If you get too close to your prey, you may spook it, causing it to run off before you can shoot. In large part because of PSAKs being very dangerous garbage until very recently. The only real question is what twist rate to go with. I was understanding that my 5.56 with 55 grain bullet needed a twist of 1:7 to be right. This issue isnt unique to 300 Blackout bullets, though. The only part you need to change is the barrel. Most AR-15 upper 300 Blackout rifles feature the 1:7 and 1:8 twist rate, which is the rifle barrels spin rate. Heck, my Walmart still sells .308 after the evil 5.56 and handgun ammo purge. Nobody shows pics like mine because it was not big dealnothing to talk about. Not a bad question at all. One thing is true your bullet accelerates until it either runs out of fuel or leaves the barrel (technically, youll start losing velocity before all the powder burns as a portion of the energy is used to overcome the friction of the barrel itself). AAC .300 BLK AR-15, The Gun Blog. Mightnt a fast burning powder expand completely enough to be maximized in a 9 barrel, while a slower burning powder would need greater length of barrel to maximize the burn? For optimal home defense with the 300 Blackout round, a barrel length of at least 6 to 8 is recommended. Cartridge Overall Length: 2.02 inches. 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? 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 6-inch .300 Blackout barrel is short enough to carry as a concealed weapon, and drawing and aiming the reasonably sized weapon is hassle-free. A 16-inch barrel will provide more velocity to compensate for the weight of the bullet, allowing it to travel further on a flat trajectory. The long Sig Titanium 7,62 is REALLY quiet. If you want your pistol to have more range, velocity, and accuracy, you can opt for an 8 to 10-inch barrel. However, if you want to hit targets at over 100 yards, the best barrel length for .300 Blackout subsonic is 16 inches. Let your fellow shooters know share this article using the Facebook, Twitter and other social media icons below. 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. 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. Longer barrel lengths offer greater accuracy and velocity, with a maximum length of 16 for the 300 BLK. I need to get the lathe going as well, and I havent had the time or patience to do it. Designed specifically for 300BLK and 7.6239, rated for .308 WIN in 16 or longer barrels. I would recommend the Silencerco Saker 7.62 instead. Chamber erosion, out of battery detonations in < 2k rounds, most of them. Short-barreled rifles come highly recommended for home defense because the compactness makes the weapon easy to wield within the walled and close quarters of a home. 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. The thing functions with everythingfrom 125 grain Sierra with 17 grains of Lil Gun to 220 grain Hornady with 10.5 of AA 1680. WebThe bullet drops about 4 inches at 100 yards, 2.5 feet at 200 yards, 8 feet at 300 yards, 18 feet at 400 yards, and 30 feet at 500 yards. The ability to shoot full auto 300 BLK through an SBR with this can attached is impressive. Really -- the largest difference is barrel length. agreed on this. It is ear safe with subs and damn near it with supersonics. or youll solve them. Ive had no problems with PSAs Cust Service. If your barrel is 8 to 10 inches, attaching a 6-inch suppressor will take the barrels length to 14 to 16-inches. The last thing you ever want is a loosening silencer while shooting rapid fire or full auto. Muzzle Velocity: 2,259 fps. 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. 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. The accuracy of a .300 Blackout barrel will depend on the exact round and barrel length you use. Ive been bitten by both. Its the pressure of expanding gas behind the bullet that accelerates it, and it doesnt fall off at 9. 9 models V Seven 300 AAC Blackout Stainless Match Barrel (8) As Low As (Save Up to $10.00) $359.99 Best Rated. The more we all know, the better organized and stronger the shooting and hunting community will be. 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. The SAAMI diagram for the 300 BLK is shown below. 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. Also, the 300 BLK shoots faster from a 16 barrel than a 9 barrel, particularly with supersonic loads. Pick the barrel length (or performance target) you want and build a load around it then you can come up with some educated rules-of-thumb of your own. Planes that increase their velocity until it reaches and exceeds that mark generates a sonic boom. Thats 8 inches of barrel for the 300 BLK 1-8. 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. 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. By and large, the relatively rapid loss of velocity confines the 300 Blackout to near medium and close ranges. 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. And it is VERY quiet AND compact. Accuracy differences would be more apparent in supersonic loads where the transition from supersonic to sonic happens before the target. Just more satisfying to me than a real press. When barrel friction on the bullet is greater than gas pressure behind the bullet, the bullet will slow. 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. Notify me of follow-up comments by email. With a warm barrel/suppressor unit, it is possible to shoot impressive groups. The length of a barrel also dictates the rifle's twist rate and thus the bullet as it travels down the barrel. But on the good side, you cant have too MANY cans. Suppressors minimize the chances of a sniper being located by sound, but they simply reduce audible emissions from their firearms muzzle end, not a projectiles characteristic crack. To avoid it from giving a shooters position, subsonic .300 BLK loads use heavier bullets and adjusted powder chargesoften tailored for a complete burn in a short barrel. WebThe 300-Blackout is a lower-power 30-caliber cartridge. 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. The 300 AAC Blackout was created by Advanced Armament Corp. and Remington primarily for the military as a way to shoot .30-caliber bullets from the M4/AR15 platform while using standard magazines. There was an article on TTAG maybe a year or so ago comparing velocity loss from from a 5.56 16 vs 10 and a 300BLK from 16 to 9. But its the opposite with the 300 AAC? A mystique surrounds the .300 BLK (AAC Blackout), and it overshadows this utility players ability to deliver All-Star numbers in a variety of roles. Sorry to be bearer of bad news. It is extremely easy to convert an AR-15 to fire 300 Blackout ammunition, and the rounds ballistic performance is different enough to justify purchasing the barrel necessary to do so. said. 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. Wheres a good source for ballistic data muzzle velocities for various bullet weights , loads, fired from various length barrels. Pretty much the only reason for a 16 300BLK is if you dont ever plan on running a suppressor and dont want to register as an SBR. 300 Blackout Fine-Tuning: Finding the Right Barrel Length for Your Rifle, For optimal performance with a suppressed, Bird Colonel Trashes Tin Eagles With False Testimony in California Assault Weapons Ban Case, Keith Olbermann Calls for Civil War as the Only Way to Stop Mass Shootings, Illinois Freedom Week Starts Today: Federal Court Blocks Enforcement of Illinois Assault Weapons Ban. This issue isnt unique to 300 Blackout bullets, though. If it's inside your house in home-defense scenarios, a short barrel will allow for better maneuverability. We will promptly replace or repair any product that we determine to be defective. One of those AI chatbots thats been in the news recently? This high-speed feature means that the bullet will spend relatively less time in motion and thus less prone to the effects of elements like the wind. creates and publishes industry standards for safety, interchangeability, reliability and quality, as well as coordinates technical data for agencies, enthusiasts and manufacturers. A fast burning powder might fully burn in those 9 inch of barrel, but even so, the pressure at the end will still be way higher than it is outside the barrel and hence the accelerating force on the bullet will still be more than friction. Heavy, expensive, and absolutely fantastic. The disadvantage with direct threading is that it will loosen up and start backing off while shooting. Subsonic 220Gr loading is 9.6Gr IMR 4227 and that is a near capacity load Id guess there is room for 11Gr. var _gaq = _gaq || []; One has operated perfectly right out of the box. You are incorrect on one critical detail: 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.. For example, with a 10.5-inch barrel, the .300 Blackout clocks an average velocity of 2200 feet per second. When you pair the barrel with .300 Blackout ammo, you get an easy-to-carry gun that spits rounds capable of penetrating heavy barriers. I was amazed at myself.
300 blackout barrel length chart
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