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if rechamber from 7x57 its the 280

you can't rechamber 7x57 to 7x64. look at the shoulder diameter, with 7x64 you get a step in the 7x57 chamber. the 280 is having a bigger shoulder diameter and so I assume it cut the 7x57 chamber completly away.



if the rifle works safely with 7x64 brass I would say its an oversized 7x64 chamber and use it this way.

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That would depend on the diameter of the 7x64, at the 43,25mm location.
My bet is that it is over 10,92mm simply due to being tapered and 10,72mm at 51.00mm.
If the taper of the 7x64 is the same as a .30/06 case, then is is a few thousandths larger for the 7x64.
Of course, if a .280 Rem chambers, then that is what it is.

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