I haven't done a side by side with and without can. Only with can in my garage, which didn't seem that quiet. Maybe nail gun level with CCI quiets. The Aguilla primer only rounds are very quiet, but they are so low powered that I haven't bothered to sight them in and am not sure I'd trust them to dispatch an animal reliably unless I was holding it down with my foot. So for now those are just fun rounds. Neither CCI quiet nor the Aquilla will cycle the pistol though. I need to try the CCI quiet for semi-auto and see how those do. I haven't gotten to test any of my cans at a range yet.