Ian,
I'd reccomend the snap caps even at higher cost. The snap caps have a rubber rim or at least something that protects the firing pin. As I'm sure you realize, Most 22's can't be dry fired without risking damage to the firing pin or the chamber. If you're going to be lots of dry fire drills..best to use the right equipment and get the snap caps. PM me, maybe we can go halfs on some!
.22 keychain bling...mmmmmm,..cooolll!