I use snap caps in all of my guns. In my 67-1, which does feature a hammer mounted firing pin, I've actually shot the rims off of 2 sets of snap caps. Think about that for a moment. Solid aircraft grade aluminum with a urethane cushion in the primer cavity and simple firing pin strike can shear the rim off completely. The simple truth is that they absorb a real shock from the firing pin strike, a shock that would otherwise be delivered to the frame and lockwork. IMO those who don't use snap caps are rather foolish. As for the cost, I would estimate that it took about 5000 strikes to shoot the rims off those snap caps in my 67-1, with 38 spl. range ammo running 19 bucks per box of 50 snap caps are a real bargain.