Originally Posted by comn-cents
I would only shoot 38spl through it. 357 is going to break the sound barrier so what's the point.
A suppressed, supersonic .357 carbine will still be a lot quieter when suppressed. Sure, subsonic is the only way to get close to the classic "Hollywood quiet" sound, and with pistol rounds the goal when shooting suppressed is usually to use subsonic ammo, but shooting a suppressor with supersonic ammo is far from pointless.
When I shoot a 5.56 or a .308 suppressed I'm always using supersonic ammo. But the silencer still drastically reduces the sound; it's quieter than a .22 and doesn't require hearing protection.