Broughton Rifle Barrels is ready to do 7mm-7.5 twists (920-922-4882). This bullet is so new we don't have any input from shooters yet but I'm guessing that a 1-8 will work, at least in the warm summer and high altitude. The 8.5 will be very marginal.
This big bullet will require some horsepower and I doubt if the 7mm-08 is big enough. I'd say the 284 will require a long action/mag box to get any velocity by getting the bullet out of the powder space. Even then I'm guessing 2700 fps will be about max velocity.
As we get more shooter input we'll know a lot more. Stay in touch and I'll try to keep you up to date.
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