I have a 6.5PRC on the go currently, yes magnum bolt face, but slightly shorter case than the 300wsm.
Performance wise basically the same as my 6.5x.284... bit of a sucker for 6.5 if I still have the x55 it would be 4 lol
Mine will be 20" with a 1:7.5 twist or there abouts with a little extra that Hugh Bradley is doing to it.
Worth looking at.
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