Yes, tap/rack/bang will clear a misfire, a snap cap or a dummy round.
A snap cap/dummy round is an object made to the proper dimensions of a cartridge in the chambering it is designed to work in. What distinguishes a snap cap from a dummy round is that a snap cap also includes a mechanism for cushioning the blow of the firing pin during dryfire practice.
What a snap cap does during practice at the range is it allows you to see whether you are flinching or not when you pull the trigger. Normally recoil obscures a flinch, but since the snap cap won't fire, it lets the flinch "shine through". And since you don't know which round is the snap cap you won't be ready for it. Once you know you've got a flinch you can get to work curing it, but the first step is finding out that you have one.
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