I am trying to get a good confident zero with a new 300 Win Mag barrel and am having a few problems. Here is what I did: I started off using winchester Power Point 180gr. ammo and after about 12 shots had a nice 2" group at 100 yards. Please remember this; I am new to high powered rifles so a 2" group is good for me. Feeling good about where my gun was hitting I decided to switch to a different ammo that I will be hunting with in AK next month: Winchester Supreme Elite XP3 180 grain. The first two bullets hit 6" low dead center so I adjusted the scope and dialed it in to the bulls eye. Q. Why would faster ammo of the same grain hit lower?
Three days later back at the range and shooting the XP3's again and my bullet totally missed the target for the first 3 shots before it starts hitting back close to where it was two days prior. The barrel was cleaned with Hoppes cleaner, a bronze brush, and then dry patched following each session at the range. TC Arms, Inc informed me that their barrels need to be fouled inorder to get good accuracy. I am having a hard time believing this since serving 22 years in the Army I have always believed a clean weapon is an accurate weapon.
Can someone please shed some light on the problems I am having? I have 3 weeks until my moose hunt and I do not feel warm and fuzzy about this rifle. Thanks!!