Fiftydriver, this is my firt post and new to the long range hunting thing. I have a weatherby 338-378 mark 5. its a nice rig but I can only groop about 7.5 in. in 500 yards. I know pretty pathetic. It has a loupold 4.5x14 scope on it right now. Ive read about the 338kahn and am interested to...