I've been lurking on this sight for awhile now and thought I would finally jump in. I really wanted to get into long range after my brother and I watched a 350 class bull walk at 620yards. Currently I am shooting a 338RUM w/300 grain hand loads . I purchased a Leupold Mark 4 6.5-20 and am hitting steel at 850yards. I ordered a Kreiger barrel and am curious if I should convert this over to a 338 edge at that time. What would be my pros and cons?