Anybody know where I can find snap caps for a 300 H&H? Is there another way to practice dry firing without damaging the firing pin? Thanks, James

You can make a snap cap by removing the primer and replacing it with a piece of resilient but not soft plastic glued into the primer pocket. With some actions, such as the post WW-I Mausers, you may not need one anyway.

A pencil eraser glued into the primer pocket of a dummy round works pretty well.