How much adjustment?

[Dr T]

I have a 20 inch T/C Encore barrel with the factory peep sight. I have the elevation set where I want it (3" high at 100 yards) but the windage is off: It is shooting about 4 inches to the left at 100 yards. There is no windage scale on the sight (or at least I have not noticed one).

How far should I move the rear sight to the right to bring the gun on target? My back of the envelope estimate is about 0.5 mm, but I am not sure this sounds right.

Thanks in advance.

tds

 

[LaserSpot]

Yes,
(~16" sight radius / 3600" to target) x 4 = .5mm to the right.

Try and make a scratch with a needle or something so you know how far you've moved it. I usually move the sight a little less than I think I need, then shoot a group. Use a brass punch.

 

[Dr T]

Thanks. It is nice to know I can still do calculations in my head.

 

[Jim Watson]

4 INCHES
100 YARDS

so why .5 MILLIMETERS?

 

[LaserSpot]

It is nice to know I can still do calculations in my head.

That's not quite true if you used the back of an envelope, is it?

so why .5 MILLIMETERS?

Half a millimeter might be easier to remember or easier to visualize than 0.0177 inches.