I have a bowers 9mm that I have used with subsonic loads that sounds about the same as my aac 7.62 can with subs. 9mm cans should not be used with non subsonic loads. If you rapid fire even with subsonics you could cause heating damage if the can is aluminum and some say not to use them with the 300wtf. So some use then some don't but if your question is does it suppress the sound my experience is that they do just about as well as a 7.62 can.