I sight my 270 in the same wayShooting USA with Jim Scouttin.
My personal theory on hunting accuracy is it's more of a big deal to be as accurate as possible on game than it is on paper. So I always tried to get be a better shooter that I was last year. My ballistics thoughts revolve around the kill zone diameter of a deer, aprox 12" but I want to hit inside of 6". My .270 Win zeroed at 200yrds is 1.5" high at 100yrds. At 300yrds it's 6.5" low, so at 300yrds is where I need to start holding my crosshairs right at the top of the back of the deer and be back in the center of the chest. 400yrds is where I have to dial in a click of elevation because I don't want to guess 12" at 400. Windage to me, is the biggest guessing game out past 300