Firing pin nose shape has less to do with reliable detonation than firing pin protrusion. I don't see why protrusion should differ from one gun brand to another but, FWIW, A H Fox guns typically have a protrusion of .050", plus or minus. From my experience differing brands of shells seat at differing depths in chambers. Those which seat very deeply can suffer from misfires due to light strikes, even when the firing pin protrusion is sufficient. B & P Comp Ones are the most susceptible to this that I have found. This is all from personal experience.
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