Loader,
The trick with elevation adjustments is to think [b]in minutes[/b]. As dmuldrew stated moa=1"@100, moa=2"@200 etc... moa=8"@800 & moa= 10"@1000. Now substitute minutes for inches, with the turrets (you didn't say if u have 'em, I'll assume u do) installed on your mil-dot scope (hopefully it's a Leupold Vari X III or high quality equivalent) the marks are set in minutes, so the 9"/3"(moa@300)= 3 minutes. With scope and gun zeroed at 100 yards, roll your elevation turret up to the 3 minute mark and your there. It will take hardly any time at all to get the swing of elevation adjustment as long as u drop this 1/4" per click thinking. May sound confusing, but once you've got your come-ups in minutes from 100 out to 1000 or so yards and shoot 2 or 3 weekends you'll wonder why you ever messed w/ those clicks.
If you happen not to have turrets get u some Butler Creek turrets (1/2 min marks)and install them, they are a good substitute for the factory Leupold turrets.
Example: Say you take a shot at 500 yards and your shot is roughly 8-9" low - moa@500 is 5", crank up 2 mins (=10") and send another round downrange, shot should be a little high, but then u can fine tune it down. (One of the reasons LRange shooters like Leupold elev. turrets are the 1/4 min marks for precision recording of come-ups. (Remember to write 'em down, and before long you'll get to know your load/rifle and will be able to adjust for the temp/humidity on almost any day)
Hope this helps ya,
Mike