I've got a lot of experience loading jacketed bullets in .308, .30-06, 6mm and 7mm. The world of cast boolits is both weird and wonderful. There's enough learning here to keep me busy for the next few decades, for sure. I've been trying to figure out an acceptable twist rate for a .308. Is there a dumbed down formula that doesn't require me to drag out Dad's slide rule? I believe my Remington 700 Varmint has a 1 in 12 twist and I'm hoping that ought to be good enough.