I found this page in my searching for good calibers for a silenced rifle. Interesting read. Hit the back buttun on the bottom of the page for more articles on the subject. Develop Subsonic
The goal of this article is to explain techniques used to safely develop and load subsonic ammunition without risking life and limb.
That first article is outdated. Back when subsonics were strictly a handloading proposition, in some cases drilling out the primer holes was the way to go.
Since then, it is no longer needed. Also, several high load density, low power powders have been developed such as Trailboss.
The problem with Trailboss is that sometimes the speed of the bullet is too slow even with a full case.
Much of the .50 Hush Puppy (a relativley new round) that I developed specifically for suppressed .50 HP rifles is with Trailboss.It was the only suitable powder that gave good load density,speed and accuracy shooting a .50 515 cast bullet that sounds about like a pop gun.
If I was looking for a suppressed CF rifle round, I'd be looking at big calibers, like the J.D. Jones 'Whisper' series or the .450 Bushmaster. With subsonic rounds you give up all the advantages of high velocity, but larger diameter, heavy bullets make up for those losses with deep penetration and big vent holes.
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