Blaine - I use a 6-24X M4200 scope on my .17Ackley Hornet for shots to a maximum of 520 yards. My bottom mil dot gives me 520 yard zero when the scope is set at 22X. A laser range finder gives me the range, I pick which mil dot to use from the chart on the side of the scope bell and take the shot. Nothing difficult. My .375's scope has stadia wires giving zeros to 400yards for the 270 gr. TSX. Modern day cheats like laser range finders make long range hitting much easier.

My .222 Sako has an 8-32X M4200 on it, but it's only a 350yard rifle due to it's trajectory and duplex (only) reticle. Mil Dots and a laser range finder take the guessing out of the equation.

Seeing your impacts on a rat field helps teach holdover and wind drift as well. I didn't see the impacts with my .220 Swift due to it's recoil however I see every one of them with the "little-case" .17's. (same drift and drop as a Swift shooting a 50gr. lead tipped spitzer or 52gr. match bullet at 3,950fps)