The worst case of dry fire I have ever seen was on an old Jennings .22 pistol. there was such a divot on the chamber mouth that a round couldn't extract due to the pressure on the side of the case from the dimple. A small round file fixed it right up and worked fine (as fine as a Jennings usually works). I'm sure that there must have been hundreds or maybe thousands of "clicks" to get to that point. I try not to dry fire other peoples rimfires, but I do it to my own and have never had any issues.
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