Good luck kctbear, keep us posted if you come up with anything that gets that thing shooting a little better. Sorry to hear your magazine is so short too, the mkII's must be a little different. I know that every rifle is different, but here are my O.A.L'S for the nosler bullets for my MKII: 165 solid base and ballistic tip 3.360", 180 grain partition 3.360", 200 grain partiton 3.355", 200 grain accubond 3.370". Since the throat or freebore on your rifle seems long you should be safe using this type of O.A.L for your rifle and see if they function through your mag. Start trying different powders too, mine likes IMR4350 near max book listings. Hope this helps a little. BSA
