Feeding problems, pls help!

Not me, I am doing too damn good with the feedbag!


My uncle's WWII bringback has passed on down to me and It has two after market magazines. About every other time I put a full mag in, the pistol will jam. Then work ok on the remaining rounds. Handloads (FMJ) or factory - no difference....


Put a friend's genuine magazine in and it works fine. The springs in the aftermarket mags seem(?) strong enuff but something is wrong, obviously. I just ordered a replacement set of springs from Wolff and included a "10% stronger" mag spring. Is it worth my while to fiddle with an aftermarket mag and replace the spring or just spend the bucks at a gun show and put the wolff spring in an original mag?


Are there any "hints and/or kinks" that I can do to the pistol itself to help feeding?


The old girl is in really fine shape but I don't think it is "collectable" so I intend to shoot it. It is pretty darn accurate considering my ageing eagle eyes and that ridiculous rear sight!


Thanks in advance for the help.


Jerry