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That much vertical spread is most likely caused by inconsistent vertical position of the stock butt in your shoulder for each shot. The more recoil the rifle has, the more vertical spread the groups will have. The lower the butt is, the higher shots go because there's less resistance making the muzzle axis point higher when bullets leave.
This happens with 22 rimfire match rifles even with their bullets taking near 3 times as long to leave the barrel.
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