TxLewis...
I have shot the 115 grain 9mms (from Bass Pro) through my new AR can. They are supersonic, so they are not noticeably 'quiet'. They sound almost exactly the same as a .223 suppressed signature.
Grab a box or two of the 147 grain, winchesters, from Wal-Mart. They are subsonic, and much more 'impressive'.
TRG