I think the issue is not only the small size of the bolt tenons but the diameter of the thread on the barrel and the thickness of the receiver where the barrel screw in.( I have a spare Howa mini barrel at work I can measure on Monday. Or we can ask wingman).
My understanding is that it is a bit the same problem when you starts to get stiff loads in 28 nosler into a tikka t3.
Not enough steel around the chamber (1” or 25.4mm thread tenon diameter) where a Remington 700 will handle it better with a 27mm tenon thread diameter ( same pitch in both cases at 16tpi, so same depth of thread).
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