projectile traveling subsonic, 1680 powder, is 10.9 grains. Sellier & Bellot 200 grain 300BLK subsonic document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Brandon Maddox, CEO and owner of Silencer Central, is recognized as a national thought leader on Class 3 firearms. Read Less. The waveforms are not averaged, decimated, or filtered. 300 BLK loads tend to burn ALL of their powder in 8-10" of barrel while 5.56 loads are optimized for longer barrels and will have a LOT of flash and blast out of a short barrel, so there's one component to consider. I have two ARs in .300 BLK with unsupressed 10.5 barrels (I live in CA where suppressors are verboten). Fig 2a. Minimum Velocity: 1041 fps / 709.8 mph PEW Science Members also get more data! Probably the most prolific in recent years is the .300 blackout, designed specifically to accommodate both subsonic and supersonic loads in the same rifle with minimal adjustments. I looked at getting one a couple times but I really dont want another caliber to keep up with. You are better getting a barrel that is 3" longer. For instance, the relatively low-powered .22 rimfire is pretty easy to take down to hearing safe levels (and it gets quieter if you use weaker . Fig. Lets look at two reasons to use subsonic ammo in your firearm. Scopes For Beginners: What is the Parallax Adjustment Knob and How Do I Use It? I dont know, if I could get the whole gunm that color thatd be nice. At distance, especially, the 6.5 Grendel outdoes both. However, if you regularly use a suppressor or shoot 22LR at 100 or more yards, subsonic ammo is probably a good idea. Ive shot both 220g subsonic and 120g supersonic with never a single cycling issueand I built my guns from PSA kits! The Resonator K is designed and manufactured by YHM. This is why youll see that most, if not all. Silencers only marginally suppress a gun blast, bringing the levels down to around 120-150dB. The first is with a suppressor. It cracks me up, that the 320 pound, crisco leaking computer chair army speaks of subjects that they "read" on the internet. 300 Blackout load. Can you shoot 300 blackout in a 7.62 suppressor? There was also a greater range, from 152.4dB to 164.5dB, representing 12 dB difference, or more than 10 time as much acoustic energy for the top end of the pistol spectrum. As the nations largest silencer dealer, we are often asked: how loud is a gunshot? The next question is often how loud is a gunshot with a silencer? To answer these questions, we need to look at a few things first in order to understand whats going on. Having worked in the lumber business, green white or bur oak will stain a metal blue with the help of moisture. At 15mph, that would be less than 100yds. It has a 1.5-inch diameter and is 7.9 inches in length. The 5.56 and 300 BLK from this barrel length will be equally effective at point blank, and since Im assuming the same platform would be used for either, the overall length and ergonomics wont change either. Maddox is passionate about varmint hunting and has spent more than a decade honing his expertise in the Western Dakota prairies. Lets look at how subsonic ammo can answer all those questions. If it ends up becoming a range toy or a little truck gun, all the same. I read an article from a surgeon stating he worked on a patient admitted with five 5.56 wounds that all missed vitals, but also all closed up. 300 Blackout offers a range of performance, in both supersonic and subsonic loadings. Here are the search results of the thread how loud is a 300 blackout without suppressor from Bing. At that point why not just 7.6239 and save 50% on ammo costs?