Optical zero?

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   Paul, That is what the hole in the tin foil is for. it changes the F ratio of the scope that is an old trick that they did with reflector scopes (telescopes). 

The biggest problem is the cross hairs and the design of the internals of your scope. There are glass optics that move up and down left to right that are inside the scope tube. but the cross hairs always look as if they are in the center even if you have the turret turned right to the top or to the bottom so you will not know for sure if you are truly looking at the center or not.   

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nunga Members Profile Send Private Message Find Members Posts Visit Members Homepage Add to Buddy List Admin Joined: 09 Mar 2013 Location: Pukekohe Status: Offline Posts: 1070	Post Options Post Reply Quote nunga Report Post Thanks(0) Quote Reply Posted: 26 Sep 2025 at 9:04am
	Paul, That is what the hole in the tin foil is for. it changes the F ratio of the scope that is an old trick that they did with reflector scopes (telescopes). The biggest problem is the cross hairs and the design of the internals of your scope. There are glass optics that move up and down left to right that are inside the scope tube. but the cross hairs always look as if they are in the center even if you have the turret turned right to the top or to the bottom so you will not know for sure if you are truly looking at the center or not.
	2nd place HP springer - WFTF World Championships 2014

kruzaroad Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 03 Jul 2022 Location: Hastings 4 now Status: Offline Posts: 2534	Post Options Post Reply Quote kruzaroad Report Post Thanks(0) Quote Reply Posted: 26 Sep 2025 at 2:24pm
	Thats what I was expecting gpt to do. I gave it the pellet weight and volicity, shim angle, zero, scope, rifle, distance, how high above bull it hit. My thinking was it would work out arc of pellet of pellet for that distance, 50m. Then then check at 6.25m that pellet was 15mm above bull,.work out how many clicks above zero i was, subtract the 25• shim angle out from the equation, give me a scope height. Mathematical it sounds feasible to me.