If piercing in two different brands of factory ammunition discounts the factory, then leaving ammo in direct sunlight on a hot day is another possibility. Restricting bullet release with a short chamber neck or tight throat will also do it. Or, out of spec firing pin. And/or firing pin hole.
Again, this has nothing to do with the gas system and its parts.
Lazy, interesting your additional note on the firing pin tip wear. I've pierced primers while supercharging 223 to reach 1,000yds. It starts about 25K lbs over SAAMI. This looks like the same including the cratering. PTG sells Rem bolts with optional finer 0.062" tips (the standard is 0.075"), and narrower pin holes to match. Less clearance between the pin and the hole supports the primer at higher pressures. Also, all the 223 F Class shooters I know use 450 primers with their 0.025" thick cups. So, if the firing pin including its protrusion is in spec it could still be related, if the bolt's firing pin hole is too big and not supporting the primer.
Again, this has nothing to do with the gas system and its parts.
Lazy, interesting your additional note on the firing pin tip wear. I've pierced primers while supercharging 223 to reach 1,000yds. It starts about 25K lbs over SAAMI. This looks like the same including the cratering. PTG sells Rem bolts with optional finer 0.062" tips (the standard is 0.075"), and narrower pin holes to match. Less clearance between the pin and the hole supports the primer at higher pressures. Also, all the 223 F Class shooters I know use 450 primers with their 0.025" thick cups. So, if the firing pin including its protrusion is in spec it could still be related, if the bolt's firing pin hole is too big and not supporting the primer.