Your holding on hair with 3" over method, you center of chest right behind front shoulder. You never 3" ove back or anything like that. If you shoot at 75 your about 3.6" high (with his load) and at 100 your 3.5" high and at 150 your dead on. At 50 yards your 2.6" high, you still hitting in the top part of the lung area. MPBR is 175 with this method and your basically shooting thru a 6" pipe from 0 to 175 yards. I think it is a good method. Since if deer are 150 you just aim and shoot.
Chap