Pistol primers and breech block damage?

[JKR]

My Shiloh has a definite dent around the firing pin hole. Is this caused by my testing with pistol primers a few years back, or is it normal wear?
I recently came into some Federal 150’s and I’m thinking I probably shouldn’t try them in the Shiloh. I did try them in the C Sharps but they’re pierced by the firing pin. It’s looking like pistol primers are a no go in my rifles.
JKR