Greydog is of course right.
So why do I recommend 9 twist? A few years ago I had a "10 twist" Shilen chambered in 257 Roberts AI. With bullets up to the 100 B Tip in length, it would shoot 3/4 MOA at worst. Anything longer it opened up closer to 3 MOA. Bullets like a 100 TTSX or a Berger 115 VLD were a pipe dream in that barrel.
The cleaning rod told me that although spec'ed 10 it was more like 10 3/8". Since the extra twist doesn't hurt anything I hedge my bets. In fact some might argue faster twists blow up varmints better and are more decisive on larger game.
Anybody who seriously concerns themselves with the adequacy of a Big 7mm for anything we hunt here short of brown bear, is a dufus. They are mostly making shidt up. Crunch! Nite-nite!
Stolen from an erudite CF member.
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