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You could use a really big drill bit, too. You can use a steel case to easily identify it if you don't shoot steel cased ammunition.
I don't think the spent primer will provide much protection for a firing pin if that is a concern with your particular gun. Use something that will slow down the firing pin without being damaged, like a piece of hard rubber. If your gun doesn't have an issue with dry firing, having no primer in the pocket would also help you identify the snap cap.
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