Having a problem with my 223AI, figured I'd turn to the brain trust here.

Rifle is a 110 long action. Removed .473 bolt head and replaced it with a used OE Savage LA/.378 bolt head. Unfortunately for me, after doing this I started experiencing primer cratering & occasional piercing even with 'standard' loads that never showed pressure in any of my other 223 bolt guns. Switched from CCI-400s to CCI-450s, cratering & piercing went away.

Replaced the factory 223 tube with a Criterion 223AI barrel, and still occasionally see slightly cratered primers...but primer radius looks good and bolt swipe/lift/stickiness is normal. Yesterday, I blanked a few primers shooting a load I had shot many times before, and even popped a couple primers which caused me to stop shooting.

Other than verifying the quality of my loads...

Should I check firing pin protrusion? I did not do that when I swapped bolt heads.

Should I consider having the firing pin hole bushed, or replacing the firing pin itself? The firing pin started life as 270 Win, and the bolt head came off a rifle of similar vintage...

Thanks