Sight Adjustment

[C Wallingford]

Several months back someone posted a formula for determining the amount to remove when adjusting sights. I have looked in the archives and cannot seem to locate that posting. Do any of you have that information.

[SCLoyalist]

Sight adj=    Desired-change-in-impact * Sight Radius/Distance to target,    all in inches

For my rifle, the sight radius (or distance between front and rear sight) is 28 inches.  If I want to hit 4 inches higher at 100 yds (or 3600 inches), sight adjustment would be  4*28/3600"   or .031", or approx. 1/32".  I could either remove that much metal off the front sight, or raise an adjustable rear sight by that much.   

For 4" lower impact, lower the rear sight or put in a taller front sight.  To move impact point to the left, move rear sight to the left or front sight to right, etc.   

[Randy Hedden]

An easy way to remember which way to move a sight to change point of impact is to remember "FORS" which stands for front opposite rear the same.

Randy Hedden

[C Wallingford]

Thanks, SCLoyalist. That was the information I couldn't find.