Symptoms of an oversized firing pin hole are easy to spot.
With light loads, or plain vanilla loads, you get cratering, but no other signs of pressure... the outer edges of the primers look normal and rounded, and the edge of the primer dent looks "soft", that is it's rounded, and not sharp like the edge in the photo of the case you have in your post (the one not perforated). The cratering looks different from that of heavy loads.
With heavy loads, the cratering has a straight wall on the outside, sorta like you turned a shot glass upside down. That is because the pin is being pushed back by the pressure, and the primer metal follows the pin, and conforms to the straight wall of the firing pin hole. The edge is sharp, and feels sharp as you draw your finger across it.
But with an oversized pin hole, the primer metal flows into the space around the pin because it is not supported.
The "crater" has a soft/rounded look, like if you sliced a donut or bagel in half and lay the top half on the table.
This donut or bagel look is the classic look of an oversized pin hole.
(This can also happen with a firing pin hole that is proper, but beveled with a 45° countersink because the edges of the hole were burred from drilling too fast. In this case, the primer flows into the 45° countersunk space.)
If you look at the fired case in your first post... not the one that is missing the middle, but the other one... it has a very sharp edge at the edge of the pin dent...
... It would be IMPOSSIBLE to have this sharp edge if the hole were oversized.
Oversized firing pin holes are common with Remington rifles... so much so, that there is a cottage industry in the USA of gunsmiths that specialize in drilling the bolts out, putting bushings in them, and then re-drilling the bushing to the proper size.
And, if suspected, it is easy to check... let the pin down, and look at the pin sticking out of the bolt face... there should be no more than a few thou (0.002" or 0.003") of clearance.
I recently had two Remington XR-100 brought in, and both needed the bolts to be replaced or bushed and re-drilled because the holes were oversized.
Hope this sheds some light on it.
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