I'd doubt that it's set for rimfire parallax. Could be wrong of course.
The lower the power the less noticeable the parallax becomes but would be visible at 6x at the likes of 30 yds and under. I have a 1-4 Leupold that is terrible on 4x at 25 yds whilst with my M8-3X which is on an air rifle, the parallax is barely discernable.
I've also got a cheap Tasco Pronghorn 4x which is quite happy on a 22 rf and virtually paralkax free at shorter ranges.
The only way to tell is to aim at something at say 25 yds and carefully move your head slightly up/down or left/right. The reticle will move relative to your point of aim.
CF scopes can be set for RF parallax by adjusting the objective lens in its thread.
I wouldn't be attempting that though with a fine old M8-6X.
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