It's time to build another rifle. It won't be the most practical, but I've got a long range itch to scratch. My plan is to purchase an assembled upper in .223 wylde, with a 20" to 24" inch heavy barrel. I'll be feeding it 69 to 77 gr pills. My question is: which would be the better twist rate for what I'm doing, 1/7 or 1/8? I don't have the tools to build the upper myself, so spec-ing out a bare barrel is out of the question. there are many more options with the 1/8 twist, but if the 1/7 is better, I'll just have to beat the bushes till I find what I'm looking for.