Keepin_Jeepin
New member
So I have a 45 can on the way, should be approved this month or next. The reason I went with .45 because its typically inherently subsonic. I want to make the quietest rifle possible. Platform will be a T/C G2 contender single shot for obvious reasons. The suppressor is a YHM Sidewinder 45
I am afraid of loads working up supersonic speeds at greater barrel length. Judging by various sources including ballistics by the inch with standard pressure loads that should not be much of an issue, and I can load my own if necessary. Id prefer to buy standard velocity stuff from the store that is going to stay subsonic because I dont have much brass right now in 45.
What I am really interested in though is chamber pressure, because that is a factor of noise as well. 45ACP is a low pressure round to begin with but there is a point where pressure will drop exponentially.
My question is where is that? I cant find any pressure data per inch of barrel for this round. From a 16" barrel to an 18 or 20 would it be worth the hassle going the extra length for exponentially less chamber pressure to make it noticeably less quiet? At 18 or 20 inches would standard pressure rounds be supersonic by then? I dont think they are at 18 but I dont know about 20 and beyond.
Basically how long of a barrel can I get before the law of diminishing returns?
I am afraid of loads working up supersonic speeds at greater barrel length. Judging by various sources including ballistics by the inch with standard pressure loads that should not be much of an issue, and I can load my own if necessary. Id prefer to buy standard velocity stuff from the store that is going to stay subsonic because I dont have much brass right now in 45.
What I am really interested in though is chamber pressure, because that is a factor of noise as well. 45ACP is a low pressure round to begin with but there is a point where pressure will drop exponentially.
My question is where is that? I cant find any pressure data per inch of barrel for this round. From a 16" barrel to an 18 or 20 would it be worth the hassle going the extra length for exponentially less chamber pressure to make it noticeably less quiet? At 18 or 20 inches would standard pressure rounds be supersonic by then? I dont think they are at 18 but I dont know about 20 and beyond.
Basically how long of a barrel can I get before the law of diminishing returns?