Going back too when I started. There wasn't dial uo scopes or range finders about. Think you're over complicating things. Graham Henry's rule of 3 for flat shooting guns , like 270 etc worked well. 3inches high at 100yds puts you about 3 inches low at 300. So center of chest to 300 and level with top of back at 400. Don't show day light though.
Although I'd say this is all pointless unless you have a range finder to know accurately the distance in the first place.
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