Zeroing at 100m is std target LR practice. If you noticed it there then you have found an issue. My bet is on your setup day. I've seen enormous changes in setting up scopes on my FT airguns. The trick is to do it at about 10am on a day with 1013 hpa (barametric pressure. Pick a day that's not too hot or cold. That and make sure your parallax error is completely dialed away or you're introducing phantom errors right there.
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