Better than solid soft plastic snap caps of 15 years ago... - Tipton 22 Rimfire Snap Cap 486758

As other reviewers note, these are quite durable with hard plastic smooth shells compared to the softer plastic ones that a semi-automatic's extractor tore the rims from. I've been using these with a single action revolver without difficulty, to evaluate the differences in changing springs. I feel that every firearm should have its firing pin released from the cocked position with some form of snap cap (empty rimfire cases or a shot shell with silicone caulk cured in the empty primer cavity for example).