Just bought a NEW/Never Shot Browning BAR Mark 3 in .300 win mag. Got it a week ago and finally around 4 boxes of various bullet weights in hunting bullets. I have a friend who will eventually work up a custom load for me. Does anybody know what kind of groups these rifles will do? What are they capable of doing? I suppose they are not as good as a bolt action, but how much worse. Should I expect less than 1" groups out of it?