Re: Barrel break in overpressure?
RaptorX,
What I'm seeing here is perfectly normal pressure signs, albeit from a rifle that has a somewhat oversized firing pin opening. A tighter fit between pin and hole would eliminate that cratering. I've seen plenty worse, to the point of needing to have the bolt face bushed by a gunsmith to get the fit more in line with what they should be.
People tend to use primers to judge pressures, which is fine to a point. Primers often can give you a good idea what sort of presures you're dealing with. The caution here is that primers will also lie to you faster than Barack Obama. There's a number of other conditions in a rifle's chamber, botl face or striker that can give the appearance of high pressures, even with very mild loads. I've also seen proof level loads that the vast majority of handloaders would have said were fairly mild loads, based soley on primer appearance. Personally, I take the primer condition into consideration, but it has to be evaluated with other signs being taken into account along with several other factors.
