Thread: 308 Subsonics

Originally Posted by veitnamcam

I would say your subs are not actually subsonic if it is that loud.

The heavier the projectile and the shorter the barrel the louder they will be as muzzel pressures are higher.
With a 90grn xtp and a 22inch barrel the firing pin and then the thock of the bullet hitting its target is literally the loudest thing from the shooters perspective.

It's not a supersonic crack, so I would say not.

Originally Posted by Pommy

You using factory ammo or rolling your own?

Factory uses slow powders to help cycle those naughty semis which makes more pressure at the muzzle.

Factory. The slow powder thing makes sense. I've noticed they are very smoky/dirty, does that fit?

Originally Posted by mimms2

a) chrony them.
b) roll your own.
c) shorter barrels will have more powder going out the front (= more loud). Factory subs are probably loaded for full length rifles. Check the box, should give specs.

a) No chronograph
b) No interest
c) That makes sense. Manufacturers data: 1050 fps out of a 16 inch barrel (my barrel is 16.5 inch).