Reloading offers several advantages. The two best for a hunter is (1) is the larger selection of bullet choices in terms of weight and design and (2) the ability to shoot more for your money.
Most talk about getting pinpoint accuracy out of reloading which is good, but few speak of how much more trigger time you can get when you reload ammo. Good shooting form in varied shooting positions will improve groups.
For 400 yard shoots reloading can make a difference. For instance factory Hornady 7mm-08 139 grain Interlock SP ammo will keyhole at 400 yards in my rifle. I can reload the same bullet and keep it from tumbling.