Troutman10: I recommend you sight your .30-06 to be 2" high at 100 yards. This will make you sighted right on at about 200 yards and maybe 7" low at 300 yards, depending on the bullet weight you use. Use some of the freely available ballistics programs to get more detailed information. The idea is that over a decent range window you simply aim at the center of the vitals area and shoot, making no adjustment for your distance from the target in relation to your sight-in range and your cartridges peculiar ballistics. If you strike your target 3" above the center of the vitals or 3" below the center of the vitals this will still be a killing shot. Probably 7" below the center of the vitals on a deer is still a killing shot, though it may be getting dicey.

I just checked an exemplary commercial loading. A Federal cartridge loaded with a 150 Grain Sierra Game King bullet sighted in for 200 yards is 1.7" high at 100 yards and 7.6" low at 300 yards. If you were 2" high at 100 yards with this load you would be dead on just beyond 200 yards and a little less than 7.6" low at 300 yards. Different bullets/cartridges will result in somewhat different ballistics, but maybe not too far off of this general set of numbers.

In special cases a different sight-in may be preferable. For example, for elk hunting I sighted my .30-06 shooting 180 grain bullets to be 3" high at 100 yards. Elk have larger vitals areas than deer do, and I think this adjustment made sense for an elk hunt.