[353FMG]

Then why not use supersonic ammo with a silencer? Isn’t it all about em vee square?

[JRandomFreeper]

Noise from a firearm comes from 3 different sources.

1) the action. That is not very loud.

2) the chemical explosion of the powder. That's what suppressors supress.

3) supersonic crack of a bullet as it exceeds the speed of sound. A suppressor does nothing for that significant noise.

/johnny

[Nachoman]

Then why not use supersonic ammo with a silencer? Isn’t it all about em vee square?.

No. A bullet usually doesn't reach maximum velocity until it has exited the muzzle. Not all rounds are effective at subsonic velocities, so their use is impractical with some guns. But the supersonic "crack" will seem to occur away from the gun which provides some tactical advantage to the shooter.