A couple of the posters above are spot-on. 50 yards tells you half as much as 100 yards does and 100 tells you almost nothing about shooting at 500 yards.
I'll also add, if you plan to shoot live animals at 500 yards then some of your extensive range work must be done at distances well beyond that...like 750-800+ yards.
Then, shoot off your pack, rock, brush or sticks and see what your true field range should/could/might be. Keep 'em all in a 6" circle, in the center of the target and you'll start to get a notion of what you effectively can do in the field.
Remember your Boy Scout Motto: Be Prepared!
My motto: practice far, work in close!