Thread: Any ideas? Cratered primers and looks as though the strike is all over the primer

It's not likely to be an 'oversize' firing pin hole, there is a requirement for a bit of clearance in a field rifle to allow any crap to get outta the way. What it's most likely to be is an oversized chamfer on the bolt face end of the firing pin hole.

Not ideal - but not a cause for concern unless you are getting pierced primers in which case it needs either bushing (which if done correctly isn't a safety issue) or the firing pin hole chamfer filled in.