If his sights were dead on as is.... he will need to drift either the front or rear sight a hair in it's dovetail to make up the difference.
Drift equals secure the barrel against something solid like a block of wood and then hit the sight with a hammer and a punch made of brass or hardwood.
It's not rocket surgery!
Andy (at Skinner's Sights) sent me a gorgeous brass punch designed specifically for drifting sights in dovetails. (It was a gracious goodwill gesture to compensate for an earlier shipping delay/error.) I love showing it to my "shooting- enthusiast" friends and challenging them to figure-out what the hell it is!
hxxp://www.skinnersights.com/testimonials_12.html
If Tall Guy gets the rear sight properly centred, are you confident it will be at the same elevation that it was at when he got those good shooting results? Otherwise, drifting the front sight is a left-right issue, irrelevant to shooting high ... which is our challenge/concern.
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