ORIGINAL: stalkingbear
I Vizualize a 10" pipe and sight in so that the bullet point of impact will stay within + or - 5 inches for optimum point blank range.
I used to zero at 300 yds. put me +4" at 100. But for me it's a lot more instinctive to hold over at long range than to hold under close up. So after blowing the backstraps out of a few whitetails, I went to a 100 yd zero during deer season.