I've got some very old CCI large rifle primers that i've been using through the years to load for my old savage 99 300 savage and i'm getting one every once in a while that just won't fire and it's not the firing pin spring its got a good strike on the primer and i've got several boxes of magnum large rifle primers my 270 wsm and i was wandering if it was dangerous to use a magnum primer for my 300 savage load.