I had one for a little while, the only pellets I found that worked well in the mags without jamming them up were the shorter ones.. I used to use Accupells in mine, but JSB Express might work as well ( they weren't invented when I had my Skan )
Try Accupells or JSB Express
Make sure the pellets seat in the mag correctly and are held in place with the rubber band.
The trigger isn't great, don't expect pellet on pellet performance, but sub 1" at 30 yards should be possible without too much practice.