300yd zero with a standard duplex(leupold), crosshairs level with goats back should be 400, post level with back 500. Puts me in vitals with the majority of my magnum rifles.I was a little worried about kick with my 300wsm but it doesn't (to me) kick any harder then my 25-06. As for the holdover I know my hold overs at 400 and 500 yards. My scope goes from a thick post to a thin wire at the cross hairs. It works out that the point of where the thick to thin meeting is my 400 yard hold so I'm not guessing. Past 500 and a prone position I would pass the shot or do some more crawling and sneaking to get withen the 400 yard wheel house.