I have a very very low round count Mark V Ultralight and am contemplating a rebarrel, if possible. How much work/money is invlolved in turning this thing into a 6.5/300wby. Can I just screw a new barrel on, or is it much more involved. My dilemma is I own four gun, three of which (including the wby) are 30 cal. I have 300PRC that is my go to but want a flat long range caliber for deer and smaller game. Looking for ideas.