Andrew, I also have a Supernova and just recently purchased a 2-pack of the A-Zoom aluminum snap caps. They cycle just fine, but unfortunately they are getting chewed up pretty good from just a few cycles. I'm getting radial gouges on the face around the "primer". I can attach photos if you'd like to see them. Your message goes back to last year I notice, did you eventually find snap caps that work well for you?