this may be a topic all of you have already discussed but i was wondering what the perfect amount of firing pin protrusion is. i am using br4 primers if that makes a difference. the other day i had one that would not go off and so i lofted the bolt and inspected replaced and fired it again, and it went off. i would like to know that my rifle will never do this again. so i would like to adjust the firing pin and i took the bolt apart and can see that it can be adjusted. i just don't know what safe maximum protrusion would be without rupturing primers? ...