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It will be easier to neck 7mm Rem mag up or 338 Win mag down than to form 300 Win mag. The shoulder is further forward on the 300 forcing you to move that shoulder back. If you do this, you'll need to neck ream the finished 308 Norma case or you may have problems later. I used 338 cases since I don't like to form anything from a cartridge that I already use(7mmRem mag&300 Win mag). This precludes the faint possibility of misidentification of ammo by someone other than myself. In addition, necking 338 down allows you to precisely control the base to shoulder length preventing or reducing the possibility of case stretching during fireforming.
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