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How to adjust zero

YetterIsBetter

Private
Minuteman
Nov 26, 2020
57
24
Middle Earth
In a perfect world I'd zero my optic at 100m on a flat range. I don't have that. What I do have is a 100 yd range on a slight upwards slope. The target sits about 20ft higher than the shooting position.

How can I adjust my zero to be a true 100m zero after having zeroed it on this less than ideal range? How do I figure out how many inches up or down I should adjust?
 
In a perfect world I'd zero my optic at 100m on a flat range. I don't have that. What I do have is a 100 yd range on a slight upwards slope. The target sits about 20ft higher than the shooting position.

How can I adjust my zero to be a true 100m zero after having zeroed it on this less than ideal range? How do I figure out how many inches up or down I should adjust?
I had the same situation, almost to exact elevation. I sighted in numerous calibers for various purposes and found no problems of any significant.
 
The generic answer is: use a ballistic calculator to check how many clicks you need to make with your rifle zeroed at 100m to be poa=poi at your available range. (And -- yes -- chances are that in your specific case it will be within 0.1 mrad.)
 
I wouldn’t adjust it. That isn’t going to change a darn thing. A simple Pythagorean formula will tell you it’s 300.66 ft.

You will never ever be that accurate to need to worry about it.


Look at the brain on Dillhole.

My kids recently asking me why they need to know how to solve for X....and professor Dillhole knows.
 
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Look at the brain on Dillhole.

My kids recently asking me why they need to know how to solve for X....and professor Dillhole knows.
Not to mention that the distance affecting drop is still 300 feet. That additional 8” is the wind distance.
 
I liked the set it at 100 yards then forget it , 4 years later have not had to play around with it yet . I do have to remember to return my wind to zero after each use . I shoot on a windy day and adjust it then forget have to recenter it on low or no wind days I am horrible at remembering to do that being lazy and forgetful is horrible ..