also with the 280 barrel the impact of different weight bullets is drastic at 100 yards between 120's 140's an 160's all are 200fps apart according to my chrono but the difference at 100 yards is roughly 8 inches in hieght. I've just never delt with a rifle that's this finnessfull I should say. (pardon the spelling) Thank you fro the replys.
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What are you shooting factory or reloaded ammo? If your shooting factory ammo and having that drastic POI change between bullet weights I'd start by checking your scope, mount and rings. Once you determine your sighting system is good, stick with one bullet weight to see if you cam get a group. If your shooting reloads spend the bucks for a box of factory ammo just to rule out any problems with your reloads.
I might be wrong but but in my opinion it doesn't sound like a barrel problem.
Good Luck.