I'm not quite sure where to ask it so I figure this is as good a place as any.

I'm attempting to use ballistic calculations to get a zero for a couple milsurp rifles I have using a 25yd range. I know with scopes you adjust your calculations off the scope center height and I'm assuming that something similar can be done with iron sights but as I try to work it out in my head it just leaves me lost. I'm thinking I would measure half the barrel diameter subtracted from the the top of the sight blade?



Does anyone know how I would measure my iron sights to figure out trajectory?

Thanks.
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