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In the old days, it was common for a firing pin in a rimfire firearm to strike the edge of the chamber if there was no cartridge or snap cap. That soon battered the edge of the chamber and the result was that cartridges would no longer chamber. With a few exceptions, modern .22's (for practical purposes the only rimfires still being used) are made with a positive firing pin stop that will prevent that from happening.
Still snap caps in .22's are not a bad idea, and if you dryfire a .22 without them, check the gun every so often to make sure the firing pin is not hitting the breech face.
Jim
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