I got some of the .45 colt A-Zoom snap caps to check the conversion cylinder I got for a BP cylinder and for dry-fire practice. They have high quality aluminum bodies and tough but rubbery plastic in the primer. It leaves a great impression of where the firing pin hits and they're perfect for checking where the pin(s) are striking... and provides a similar amount of resistance that a real primer would. They were less than $10 w/shipping for the pack of six.
I'd recommend them for any weapon, even if you weren't worried about damage from dry firing on an empty chamber... for instance you may be doing some work on your weapon and need to check the cycling/action and make sure the primers were being hit hard enough and in the right place.