That sucks about your scope. Yes..the Sig ASP20 does have some snap to it.
We were shooting the HW97, HW80, Diana 48, and ASP 20. I was surprised at how much snap it does have, and it was the loudest of the bunch. I could only tell that when I stepped away and others were shooting. We had 2 stations set up, so when it was another employees turn, I could sit and observe between the two stations with my binoculars. I think the 48 was next loudest followed by the 80 then the 97. I'd have to confirm that with testing, but I really have no need to at this time.
I'd also argue that the "kick" followed the same progression. I noticed the HW80 had some twang relative to the 48, but it shot better than the 48 when it wasnt loosening the screws (the 80 was the worst offender here--kept needing to check the screws as soon as the shot groups would open up). The 80 is the newest gun with probably fewer than 500 shots, and it had the most twang. Still a pleasure to shoot, and I did recently do a "service and lube" on my 48 which could explain how smooth it was shooting.
The 97 and asp20 had the least twangy and cleanest shot cycles of the group, followed by the 48 then the 80.