I am going to have my M70 rebarreled to 280 Ackley since I can now get Nosler brass. I will be shooting 160 grain and possibly 175 grain bullets. I don't shoot competitively, but I want at least MOA. I prefer to have the barrel manufacturer do all of the fit and finish since there really aren't any gunsmith's near me that can do the work. I am considering Pac-Nor, Douglas, ER Shaw, and possibly Hart. Hart is starting to get out of my price range. Any thoughts and experiences would be appreciated--including proper twist rate for the heavier bullets.