I’m building a 300 blackout ar-15. Trying to decide the best twist rate for accuracy. It needs to be 16” long and will be shooting mostly if not all heavy subsonic rounds in the 190-200’s range?
thanks in advanced
I’m building a 300 blackout ar-15. Trying to decide the best twist rate for accuracy. It needs to be 16” long and will be shooting mostly if not all heavy subsonic rounds in the 190-200’s range?
thanks in advanced
I own 2, but subsonic ammo 190 plus is great for
The home in a short barrel and a suppressor, I also have a 16 inch barreled version however even at 100 yards it’s useless and has less energy than A 45 caliber round, and at 100 yards you’re looking at 18 inches of drop which is huge, along with the fact that if hunting is the goal forget it. Now at 200 yards if you could even make the shot you’re Now looking at 6 and a half feet of drop, And This is actual data from testing using strelok pro using real data and not factory specs off the web. For 220 gr subsonic Sig elite match. and all my weapon, and scope data, scope height etc
I also tested the 190 gr subx Hornady and at 200 yards it hits with whopping 350 ft pounds. With those numbers and the dramatic bullet drop other than shooting from a bench and paper for shits and giggles it’s a bust. You have to run supersonic ammo for any type of practical use.
If you’re going for home protection 7 1/2 to 10 inch barrel is all you need that said there’s so many more useful calibers than the 300. Its sole purpose was to be used on the 14.5 inch barreled M4, and combinations down to 7.5 inches. And equipped with a suppressor, and then those types of configurations for use indoors it’s perfect and about the quietest suppressed round I have experienced.
I another thing to take note is that in a 16 inch configuration with a 125 gr supersonic round, when the military tested then they claimed 500 yard effective range, lower the 147 inches of drop, Whether it’s kind of ridiculous, but to each his own and as I don’t know your purpose maybe you have some specific purpose for your desired configuration I’m not aware of. But if hunting or even target shooting are your goals there are about a dozen alternatives that are better.
Based on some of the people on this forum I’m sure someone will disagree or is an expert on ammunition and custom hand loading which in the case in my opinion I’m only commenting on off-the-shelf and readily available factory available and firearm components.
Best of luck on your build