Guessing you checked primary extraction at the time, but wouldn't hurt to double check.
Another question, does factory ammo act the same?
Is it an aftermarket barrel?
Small shank or large shank?
One problem that some may argue with is that using larger diameter, higher pressure cartridges in a small shank will cause more "chamber stretch". With looser fitting threads the "stretch" is more. Regardless if the action itself is the same outside diameter.
Just some thoughts.
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