From what I've seen in comparison videos, only a suppressed .22LR with subsonic ammo is capable of being nearly silent when fired.  The semi-auto action can actually be louder than the report from the round.  Higher calibers will logically be louder, as will ANY caliber that's not subsonic.

Side note: To my knowledge, there's only one revolver that can effectively use a suppressor: the Russian Nagant M1895.  When fired, the cylinder moves slightly forward to create a seal between the chamber and the barrel.  This prevents gases from escaping out of the sides of the cylinder.  So, when you see someone in a movie using a suppressed revolver, it's complete BS.

I've shot 147 gr 9 mm subsonic and that was decently quiet.  Beyond that, everything wasn't that quiet.  I haven't shot 300 Blk subsonic, but heard that those can be pretty quiet.  Funny thing about .22 lr though is that's one where the pitch tends to bother me.  It's not loud, but I think the high pitch.  Usually with pistols though, rifles seem ok without ear pro. 

Suppressed revolver?  Blasphemy!     Nah, if cans become legal here, I can envision Stang having a few on revolvers.   

I've shot 147 gr 9 mm subsonic and that was decently quiet.  Beyond that, everything wasn't that quiet.  I haven't shot 300 Blk subsonic, but heard that those can be pretty quiet.  Funny thing about .22 lr though is that's one where the pitch tends to bother me.  It's not loud, but I think the high pitch.  Usually with pistols though, rifles seem ok without ear pro. 

Suppressed revolver?  Blasphemy!     Nah, if cans become legal here, I can envision Stang having a few on revolvers.   

poof poof

Sat 2 benches down from a guy shooting a garand. Idk how ww2 vets arent deaf.

Sent from my SM-G950U using Tapatalk