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I don't know what the heat treating process for an FN is, but if that would be a Mauser I would say the heat treating was done incorrectly. I have seen a few Mauser re-barrels that had "accident" loads run through them and there was evidence of bolt lug and receiver lug set back before cracking.
As for the 6.5 Grendel, the bolt face has to be opened up too much. I did a 6.8 with a .223 bolt and it took a lot of the bolt lugs away. With the Grendel change over, is more a matter of downgrading the strength of the bolt than too much of an increase in thrust.
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