ive seen it. my brothers marlin 30-30. We were sighting it in, and got the scope pretty well dialed with 150gr reloads he bought. THen we tried some factory leverevolution loads, POI was about 3 inches down and 8 inches left... tried more of the reloads and it was back to center hits...
As for your situation, lighter bullets or higher velocity will cause POI to shift higher.... so it goes to reason that higher velocity AND lighter bullets will hit MUCH higher....
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