A mature whitetail has about a 7 or 8 inch kill zone. What your really trying to acomplish is what is called "Maximum Point Blank Range". Whereas you hold center mass of kill zone regardless of range out to a maximum distance where the bullet never rises or dips below 1/2 of the kill zone. your PBR is probably closer to 375 for a no guess shot on a whitetail and maybe 425 or so for Elk with a 12" kill zone.
If this is what your after anyway.
OK, ran some numbers for ya on point blank.
7" kill zone Deer: zero at 300 yards, maximum pbr 355 rounded to nearest 5, 2.66 high at 100 yards
12" kill zone Elk: zero at 375 yards, maximum pbr 440 rounded to neares 5, 4.02 high at 100 yards
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