I had a 3 3/8" Automag II when I was really too broke to be buying firearms. Per the letter from the factory to the previous owner that came with it (he'd sent it back because it wouldn't run), they only guaranteed function with Winchester Super-X (IIRC).
I only put a few mags through it before I had to sell it to pay for some bill but every shot felt like a flash-bang going off at the end of my arm.