I inherited a Model 50 from my grandpa last year. I think it was bought in 1959.
Anyway, it used to jam like crazy with anything less than 1-1/4 ounce magnum loads. After the first shot, it woulld not fully eject shells or if it did, it didn't properly load a new one.
Not sure what was causing it, but I put about 300 rounds through it in a month and that loosened it up (it had been sitting for about 20 years before I got it) and then I completely disassembled it, oiled up everything and cleaned her out real good.
Is anything broken/loose possibly? I had a problem with the fitting of the butt to the receiver at one point and this caused some fail to feed as well.