I always pack away a few spent .22 lr cases and use them as snap caps. You might have to be careful in not using a spent case from a pedestrial .22 rifle/handgun and putting it into a target .17/.22 rifle/handgun as the case might get stuck but otherwise, they've worked fine for me.
THe .22 lr case will fit into a .22 mag and .17 HMR chamber.
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- Ron V.
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