I've shot 40gr v-max's in a 1:7 with no ill effect's. I don't think the cartridge has enough velocity to get the rpms up to where the bullets will vaporize from centrifugal force. the 30's maybe.
there's a new trend among the long range shooting crowd that seem to believe that faster twists help keep the bullet stabilized when transitioning through the transonic barrier so who knows it may work out well for you.
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