Here is a label off one of my rifles. The elevation listed is the number of minutes required at any distance. The change required for a move from any distance to another is the diffrence in the two numbers. That is, when moving from 300 to 500, the change is 5 minutes (7 - 2 = 5)
Not to make life difficult, but there are several different sized 'minutes" in use on sights. make a 20 minute change on your rifle at 100 ydds and see how much the group moves.
308 Win @ 2900 fps
ELEVATION 155 AM
100 0
200 1
300 2
400 4
500 7
600 11
700 16
800 21
900 26
1000 31