Early on, Colt .38 wadcutter conversions from .38 Super used the Super magazine, cut and bent to handle rimmed midrange Specials. I figure the first factory Special magazines were in the Gil Hebard kits.

So, is there another magazine that fits the M52 well? M39, maybe. If so, could one fold, spindle, and mutilate it to hold Specials instead of 9mm?