The Marine Corps uses a 10twist in a 20" barrel on the M40 with a Suppressor currently and we use the 175gr SMK for our match ammo. I would expect the 30-06 to continue to follow suit as heavier bullets usually need a faster twist, but there are member that have a better understanding of this than myself for sure.
Magnum Contour is a heavy Sporter Contour. I'm not fully familiar with the number system though. I don't know if it's in your price range, but fluting may be the best option for you to have the best of both worlds.
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