There is no firing pin spring in the M1 Garand, you do not have a problem. Always load from the clip, never put a round in the chamber and let the bolt slam home, especially if it is in .308/7.62 NATO.
You will most always see a small indent in the primer when using a Garand or an M-14. If reloading use harder primers and seat them to the bottom of the primer pocket, like it is supposed to me done.
Scott