Thread: Sub sonic

Originally Posted by blip

So a pistol round kind of ticks the boxs

Pretty much. You are limited on velocity so have to make up for it with mass and frontal area to get the terminal effect. And you only need a tiny bit of powder to send a bullet out at 1000fps so if you have a large case it needs stuffing with something like trail boss to take up the space. Otherwise the velocities can end up all over the place.

So something like a 243 with a little 6mm bullet and 45gr of case capacity doesn't make much sense as a subsonic cartridge and would be difficult to get consistent.

Whereas a 300 blackout, 45acp, 450 bushmaster, 8.6 blackout are either naturally subsonic or don't need to be significantly down-loaded to make them so (to the point of becoming erratic), and have much bigger harder hitting bullets. Some of which are made to give some expansion at subsonic speeds.