I hunt with a 270 and use to do the 3" high at 100 but stopped that. I found that I didn't really sight it in for an exact spot but at around 3" high so really I didn't know where I was hitting except high at 100. I now sight in for 200 and know exactly where it will hit at 300, 400, and 500.
It workes for me because out to where I don't have to worry about it I don't think of it as a long shot. When I start getting out there I know I need to change my aiming point. I also find that if I sight in for 300 I forget to change my aim point at close distances in the heat of the moment.
That's what works for me.
