I picked up a M70 couple of weeks ago in 300 RUM and think I'm gonna rebarrel sooner than later. What do yall recommend on length, contour, and twist? I will probably shoot 180-220 gr bullets 90% of the time, but would like to play with some 240's. I also want to add a brake and would like to have it blend in with the barrel contour. I'm not overly concerned with weight but also dont want a boat anchor either. Kinda got long winded, but Id appreciate anyones input.