Popapi,
I went with the 8 twist specifically because I wanted to shoot the 140 grain bullets and at the time it seemed like most of the 1000 yard guns were running 8 twist barrels with the 139-142 grain bullets. I would think at least 26 inches of barrel. I run a .296 neck (I don't like to turn necks) and find that 99% of my loaded rounds will fall between .2935 and .2940. I took a standard Redding FL size die, removed the de-capping pin and expander ball and opened the neck to .2920 on a Sunnen hone. I get sufficient bullet pull and so far have not lost a case, I have some that are on the 5Th. loading and I have not had to trim them yet. I have some more powders I want to try but so far RL22 is the most promising with the Berger and IMR 4350 works best with the Partition. I have found the best accuracy at around 2700 FPS. for both bullets. If I were building another one today I would go the same route only I might use a bit lighter barrel but it would definitely be an 8 twist Broughton.
Bob
