Imo, a better version of the homemade snap cap is to punch the primer out and fill the hole with hot glue from a glue gun. That way you have something that will take the firing pin strike without issue. In addition, if the rubbery glue ever dries out or breaks up it is easily replaced. The other thing I do is to paint the base and bullet of the homemade snap cap with red nail polish and I use aluminum cases. That way, I have two visual indicators that I have something different in the magazine.
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