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i think elevation, humidity a barmetric pressue effect flight paths.
my 220 shootin loads about identical as hornady loads shoots quite noticably flatter than what the trajectory reads on paper.
so flat shooting, 1" high at 100 a fuzzer high at 200 then about 1" lkow at 300.
printing paper its shootn 2-3"slatter than than the hornady numbers
the ammo companies test ammo in doors in a controled enviroment, so it may differ from sea level to 9000 feet. i coyote hunt at 3200feet and deer and elk hunt between 7 and 9000 quite change there.
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