A spent primer has lost its ability to absorb the blow of the hammer and firing pin. Midway or Graf are two places I shop frequently. I am known to carry things to the extreme, but I keep A-Zooms in all my hammerless shotguns. I drop the hammers on them just before returning the gun to the locker. Despite what has been said over the years, pro and con, I try not to rationalize the non-use of a snap cap. I just do it....
