Drifting a sight

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Well, I am pretty sure I know the answer, but I have had fixed sights or adjustable and have never had the need to drift a sight. I have a Tisas that is 2 inches left, at about 30 feet. Elevation is perfect. So I need to drift the rear sight. My guess is, that this is trial and error? I bought one of the Wyoming sight tools that is kinetic in nature. These were highlighted in last month's American Rifleman.

So just tape mark it, and drift it a tiny bit, lock it back in, and try it out. Add more or less drift as needed. About it?
 
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Yes, drift the rear sight to the right. You can do it mathematically.
Take the distance from the target in inches, divide that number by the amount you want the point of impact on the target to move.
Take that number and multiply it by the distance from the front sight to the rear sight and that gives you the amount of drift the rear sight requires.
 
My method is to put the gun on a sandbag and use a brass rifle case rim as a sort-of punch then hit it with a hammer. I have adjusted many rear sights that way. Ruger .22 pistols have sights that are the hardest to move.
 
I have several brass punches and a small brass hammer in my “ old wooden” shooting box. By chance a sight needs “ adjusting” its easy at the firing point. One can scribe the opposite side and “ adjust” a little and fire 3 rounds and see.
 
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