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phalford, I neck down .308 to .260, and the neck O.D. of the winchester .308 brass with a bullet seated is LESS than the factory remington .260 brass with a bullet seated. Do a check as rocky says and then to be sure all is okay, load a light load, fire it and see if you can push a 7mm bullet into the fired case with your fingers, if it drops right in, then there are no problems at all.
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