There is the old system which is the cosine indicator which is effective but means you then have to put that into your app.
Then there is tbr with in the medium models of range finders and next is your range finder with tbr and a ballistics engine then you can go full blown with the kestrel paired with your range finder.
Don't forget to put some sort of bubble level system as it's an essential part of LR that most people under estimate it's worth for an ethical shot.
I have all the above t shirts and recommend for what your talking about some sort of tbr system with AB lite in it.
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