Oh… this is… just… too… cool.
The thing to catch in the video is that the rounds alternate: subsonic, supersonic. Every shot fired you’ll hear a little bit of mechanical action: that’s the action, and the suppressor. Then after ever other shot you’ll hear a “crack” sound, which is the bullet going supersonic. So just take that for what it’s worth in terms of the effect a suppressor (and proper ammo) make.
Ooo… that could make a great hog hunting rig.