Find the ammo that's shoots the best then shoot that ammo exclusively. Every gun I have owned like one bullet above all others. My 30.06 rifle liked Federal PowerShok 150 grain bullets so that is what I loaded in it. With those bullets I had confidence that I would hit what ever I aimed at. If I switched to another bullet weight or a different brand of ammo everything went south and quickly. So again I encourage you to lock on to the ammo your rifle shoots best and do not deviate from it.
Good Luck and a very Merry Christmas to ya!