Just a guess, but probably both the rifle and the cartridge are okay - or at least legal - for deer hunting in Wisconsin. There might be a magazine capacity limit issue, though - I know that there are aftermarket 5-round magazines available for the SKS, and probably "capacity restrictor blocks" that can be stuffed down into the standard 10-round fixed magazine.
I'm not surprised to see mention made of the SKS as a "hunting rifle"; lots of people bought 'em as their first step up from a .22 - mainly because of the ridiculously low price tag. Personally, I think there's some merit to the suspicion that the SKS imports were part of a Chinese plot to destroy American marksmanship (ever feel an SKS' trigger pull?).
This incident illustrates that battle rifles need not be minute-of-angle accurate.
They're definitely both OK in Wisconsin, the only applicable restriction I'm aware of is on FMJ ammunition, which is across the board. There's no magazine capacity restriction I'm aware of, though a 10+ regulation wouldn't have caught my attention anyway.