I agree with the above(or below). While generally it may not be a good idea to repeatidly dry fire a rimfire, a few clicks will not ruin a gun. If that where the case there would be plenty of ruined rimfires, and unhappy owners around. I also like to relieve the tension prior to longer storage on mine. I use an empty 22 shell if I am doing some trigger testing with multiple dry fires. The snap caps are also an idea. I usually don't like to leave a spent shell in the chamber longer term for cleanliness reasons. I guess you could clean & lightly oil a spent shell. I'll have to look closer to see If I have any possible 'pin' marks near the rim of my chambers. I have a BM handgun and rifle.