Rifle Zero

[Trapper7]

I have a friend who elk hunts with me every year. He shoots a 7MM Mag. He was telling me that he thinks hunters who zero their rifle at a distance of more than 50 yards are foolish, since there's much more margin for error at greater distances. He zeroes his in at 50 yards. He wants it to shoot about an inch high at 50 yards.

He might have the right idea, as I've seen him kill elk at distances of around 300 yards several times. In fact, checking with a range finder two years ago, he killed one at 387 yards. Anyone see any problems with this theory?