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I have to agree with SCORCH, if there is a problem with the 300WM reamer cleaning up the 308 Norma chamber is would be caused by two different neck diameters. 7mm57 Mauser chambers have been up graded to 280 Remington, it is not often the reamer of the 280 Remington will clean up the ‘generious’ neck in the Mauser chamber. Then we go back to the 308 Winchester, some believe the 308 Winchester is a short 30/06, that is until they upgrade the 308W chamber to 30/06, upgrading the chamber is when they discover the difference, the case body of the 308W has less taper than the case body of the 30/06, meaning the 30/06 reamer will not clean up the 308 W chamber. The part that does not get cleaned up in the 308 W chamber is the shoulder/case body juncture. Fired cases will have a ring around the case that is about .011” high.
F. Guffey
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