not sure about all that, sub sonic all you'll hear is the action. prime example: http://www.youtube.com/watch?v=WH4cC12EUpc&NR=1
That's a little 22 Cal in that video.
Try killing a hog with a 22 Cal...
(that's how this subject came up a few pages back)
The one in the video is still a lot louder than what they try to make ppl believe in movies....
I don't have access where I am to the specs of any silencers but even the most quiet one around is still 4x louder than the average movie props are.