Thread: Quietest firearm possible?

I have done a lot of mucking around with 30cal subs. In everything from 300WM to 300AAC. If you want to go 30cal primarily for suppressing go 300AAC/blackout. The 1:8/7 barrel is perfect but you will be limited in full power loads. Otherwise a .308 will give you a sub sonic option with high power but look for 1:10 twist or faster barrels. Clean kills with sub-sonics is all about shot placement, the brain or spine is definitely preferable.