Let's answer Aussie's post above: ballistically speaking, how much gain would he get going 280AI over a 280? Are we talking a 1/2" at 300 yards, 1" at 600 yard, etc?

Read his parameters...

I'm not being a smart ass, I would like to know myself. I've thought about and looked at many tables, but it's all different...and I don't have one to comment about. I have pondered it a bit myself though.