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! Mod theres something wrong here.

I see youre using a 284.

Maybe you could get a used 6.5-284 barrel brass and dyes from an F Class shooter and make an exact comparison with all the same gear but different bore size.

First point is that in general cases for the 6.5 cal are smaller because grain for grain of powder they generate more pressure and more barrel erosion. So powder charge and kinetic energy are less...