High mag at 100y can be difficult to get clear cross hairs and target(eye strain) without parallax adjustment.
As above the vx1 is probably a lot of the problem,great entry level hunting scope but....
Check your eye relief and reticule focus.
A vx 3 or 6 would be a huge step up(I have a 1, 3 and 6)
There are probably/is scopes with similar quality glass for less.
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