I have both for a std cartridge the 270 win is hard to improve on. The 270 Weatherby is a great cartridge and an excellent choice in a Mk V Weatherby rifle that is correctly freebored for the cartridge. If you want one sell your 270 win and buy one don t modify yours. You asked...mb

" Cheapest velocity in the world comes from a long barrel and I sure do like them. MB "