I've hunted and shot metallic silouettes with a .270 for many years. I sight them dead on at 200 yards. I tried the "2" or 3" high at 100 yards" thing and found it wasn't dead on at any useful range. I sight at 200 yards and shoot at ranges from 25 to 600 yards, 600 meters in sillouettes, and learn the trajectory. I work up handloads so they have as near as possible the same trajectory.
Sure saves me a lot of hassle when I shoot.
I've found that a laser rangefinder sure stops a lot of "I shot it at 400 yards" stories. We tend to over- or under-estimate ranges wildly with many variables like weather, light, air pressure, etc. thrown in the mix.
