Thread: 308 Twist rates v projectile weights ?

Looking at the factory (Winchester supersuppressed) ammo, 308 168gr and 300 BLK 200 gr are both rated at 1060 fps. Presumably, BLK typically have faster twist barrels and they've limited the bullet weight in the 308.

I wonder how much you can expect of the 308 subs ? They only claim 420 ft.lb at the muzzle. That's 4x the energy of a 22LR subsonic. Twice the energy of a 17HMR. It's not a 308 class cartridge made quiet; it's a rimfire class cartridge with a beefed up bullet.