03-09-2014, 12:39 AM
Looks like the primer is flowing into the gap between the firing pin and hole because there is too much space.
Pacific Tool and Gauge sell Rem700 bolts with a smaller than spec primer holes for F Class ,223 shooters. Their smaller diameter pins are 0.062" whereas a standard pin is 0.075" The hole in the bolt is machined smaller and the gap between the firing pin and hole is less. This is is so that higher pressures with magnum primers can be reached for situations like F Class shooters using .223 to reach 1,000yds. For that you skate on the edge beyond SAAMI but with quality components it is safe to do so. With the smaller, tighter hole there is more primer support and less chance of do-nuts like in your photo occurring. There is more chance of the narrower firing pin piercing the primer however if you use magnum primers which have harder cups this mitigates that problem.
Perhaps in your case the firing pin hole diameter relative to the pin diameter might be too sloppy for the loads and primers you are using in that caliber. They might not necessarily be too hot loads for the chamber but are not being supported enough at the pin hole.
Pacific Tool and Gauge sell Rem700 bolts with a smaller than spec primer holes for F Class ,223 shooters. Their smaller diameter pins are 0.062" whereas a standard pin is 0.075" The hole in the bolt is machined smaller and the gap between the firing pin and hole is less. This is is so that higher pressures with magnum primers can be reached for situations like F Class shooters using .223 to reach 1,000yds. For that you skate on the edge beyond SAAMI but with quality components it is safe to do so. With the smaller, tighter hole there is more primer support and less chance of do-nuts like in your photo occurring. There is more chance of the narrower firing pin piercing the primer however if you use magnum primers which have harder cups this mitigates that problem.
Perhaps in your case the firing pin hole diameter relative to the pin diameter might be too sloppy for the loads and primers you are using in that caliber. They might not necessarily be too hot loads for the chamber but are not being supported enough at the pin hole.