I saw an old American Rifleman article in which T.K. Lee, maker of the Lee Dot scope reticle, discussed the approach in a graphical way.
Tell him what caliber and load you were shooting and he would put a dot reticle in your scope to suit its trajectory over the "point blank" range.
Zero correctly and out to its maximum usable range, your shot would strike someplace under the dot on the target.
If the dot covered more than the vital area of the game, it was too far away.
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