I like the 6x24 Mil-Dot 4200 SF scope so much, that after the first one, I bought 2 more!
BUT, with that said, I have heard this complaint before (including with my newbie teenage son) and must confess that some folks find that the eye relief is definitely more critical with this scope then it is with other scopes. It is very seldom an occurence with me. If anything, I find this problem even more critical with my 8x-32x Burris Black Diamond.
Perhaps you should try to mount the scope on the rifle so that your face and your cheek weld is comfortable, and the distance from the eye-piece to your eye occures natural and is almost always the same ergonomically when you draw the rifle to you.