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A rifle in many cases will have a bolt or pin much heavier than the equivalent sticker or hammer, springs seem to be heavier, in general, and if tested, in general, it would probably be found that rifle actions will hit the primers with far more energy. I still don't believe that higher pressures or pin impact can ordinarily cause a failure of a primer cup. There is always a primer dent, an imprint of the bolt face, and a solid grip by the primer wall to the brass, right? That primer is literally supported everywhere. It would take a very thin metal to fail. The things are made to be far stronger than they need to be to survive handling.
One of the things that I have read is that some priming compounds generate only flame. Others are designed with flammable particles that throw sparks far forward of the flame to aid in quicker full charge ignition.
Don't ask me if it's true, a manufacturer provider the information along with photographs to demonstrate, but I have no evidence.
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