Adjusting rear sights on my SR22

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Joined
May 2, 2018
Messages
21
I am sighting in my SR22 and have read the manuals instructions on how to do it
I have the elevation set correctly and am about to work on the windage.
Currently it is shooting about 3-4" to the left.
According to the instructions I need to turn the adjusting screw counterclockwise.
My question is how far does a full turn (360 degrees) moves the POI? Half turn? Quarter turn?
I can probably figure it out my experimenting but thought someone out there may have some good input that would help me along.
 

Mobuck

Hawkeye
Joined
Dec 25, 2007
Messages
7,337
Location
missouri
I have no idea-turn it 1/2 turn and see how far it moves POI. This is the 'cave man approach'.
 
Joined
Dec 8, 2005
Messages
3,694
Location
Lemont, PA, USA 16851
I don't believe that Ruger gives a specification on movement of rear sight versus change of POI. It could be figured out but it would be a long tedious affair and you would need precision measuring tools, a Ransom Rest (at a minimum) and a lot of patience.

Secure the firearm in the rest, fire a shot at a target a known distance away. Set up a horizontal measuring device and zero it touching the rear sight blade. Turn the rear sight blade screw 1/2 turn. Measure/record the amount of movement the blade moves. Fire a shot. Measure/record the difference in the POI. Then do the same thing again and measure that POI difference. To be accurate, you'd have to do this a number of times to insure you have accurate, reliable readings for computations. That would give you an rough reading of 1/2 turn of the screw moves the blade X number of (probably hundredths) inches which would equate to the POI moving X number of inches at that diatance. Then you can use math functions to determine how far the POI should change at different distances when you turn the screw X number of turns or half turns.
 
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