Let's take a look at what the 30-06 does have,a long neck.This gives it a great advantage when shooting real world hunting bullets.The long neck allows you to shoot a wide range of bullet weights without eating up a lot of your case capacity.
This is a common misconception. Capacity in the neck of the case counts more or less the same as capacity in the body. What matters from a capacity loss perspective is the amount of the bullet below the rim, which in turn is a function of bullet length, case length, and OAL. Neck length doesn't come into it. The .30-06 would be improved by moving the shoulder forward to allow powder to be seated around the base of the bullet.
