Gary,
Just how heavy can you go with 1/7? I realize it's a matter of projectile length also, but was wondering on this.
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I have read of 90gr SMK in 7 twist, but I played it safe and got a 6.5 for my attempt at a .223 FTR.
The Valkyrie is standard with a 7 twist but I have read of some disappointments with it and the heaviest bullets.
As noted it is the length of the bullet, more than the mass. We had good luck with the old 87 gr PRL's in 1/7 twists.