I'll be looking to shoot mostly 105 Amax's, 107 SMK's, maybe try out some of the Bergers in the 100+ grain as well. I'm assuming that I need to get an 8 twist, is this correct or can I get by with a 10"? Also, I've been looking at Shilens Ratchet rifled 4 groove barrels if I get an 8 twist. Any experience/reviews worth reading out there either here or elsewhere? This barrel will be 26", I assume that is an ok length as I want to keep the weight down a little bit -- ballistically with these bullets would it really be worth getting a 28" tube or will the 26" suffice? Will be shooting to 600 yards and in I would guess (but you never know what you might need to shoot at... ;D ) Let's hear some info on the length, twist, and Ratcheted barrels by shilen for a 243 win...