There is a formula in this link
https://www.africanhuntinggazette.com/open-sight-adjustment-formula/
Type: Posts; User: stug
There is a formula in this link
https://www.africanhuntinggazette.com/open-sight-adjustment-formula/
Yep depends on distance between front and rear sights. Robbie Tiffen could quote the formula off the top of his head.