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The .246 Newton is on '06 brass shortened only about .040", the shoulder set back about that much, and more taper. Donnelly says about 4 grains less case capacity than .30-06.
Pal, what action is your guy's .256 on? It is my recollection that Newton meant to build guns on Magnum Mauser actions but WW I put paid to that idea. So he sold .256 rifles and conversion barrels for Springfields until he could get his own design in production for the big cases.
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