[4runnerman]

Yes- Best I could get was 2710 with the 175's and I was starting to show pressure signs so we ended that shooting session. Since then I have backed all my loads down to mid range and seen the accuracy come up a lot. I did like the 155 Palma Hybrid's , but wind is a issue with them at 1000 yards much more than the 175's. Not to mention the cost too.

Back to the OP. I don't know how good a 1/12 twist will work with the 175's. Probebly will, You just have to try and see what happens. Lot's of if's come into play at 1200 yards. I am still learning to dope the wind at that range myself. It's not easy to do. Bullet drop is big time at 1000 yards,must be off the wall at 1200. Do you have the scope to do it?. I mean enough adjustment or 20 moa bases?. I guess if I was in your shoes and wanting to go 1200 yards, I would be working on the 155's.