Based on my recent bad experience with snap caps at the range How long has it been since you've been to the range? - #803 by Gary_H , I am thinking of making my own.
All of my SD ammo is nickel plated, so I’m thinking crimp a bullet into a fired brass casing. My mental debate is whether to push the spent primmer out and let the firing pin hit air, or leave the spent primmer in and let the firing pin hit it. If I leave the spent primmer in, then I will definitely drill some holes in the side of the casing to positively identify it. Any thoughts?