@grandpamac , an interesting conumdrum made complex by yippy tekncrats to make life difficult for us mature old bods. Years ago I gave up the fancy dialling drama when hunting and adipted the following simpler method. This is for hunting, not precision target at long range
I graphed the trajectory lines out to 600 or so for my common calibre and bullet weights. E.g. 308win @ 150grain, 30-06 @165grain, 6.5*55 @140grain etc. Then I held these trajectory graphs over a sunlit window and moved them over each other to set the trajectory curves closely matching each other. It turns out that the point blank zero for each when approximately overlaid allows the observer to notice there is very little difference in correction up or down between common loads and calibres if a zero point of about 250-300 is selected on the scope dial or reticle. It is very easy to come down to 1-200 or up to 350-4,500, especially if the reticle has mil or boone and crockett or other hadh marks in it. I.e. rhe actual corrections required when the zero is around 300 either up or down are far less than if you have zero set at say 100. This for hunting situations but will allow pretty accurate sight corrections in field situations with minimal or no dialling once thr zero is set and trajectories are understood.
I guess one could say its an old trick by another old dog ha ha.
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