I have read this supposedly dual cartridge capability before in several
different articles and have wondered if it was true. One of my reference
books consists of reprints of the old original owner's manuals of many
semi auto pistols. The one for the FN 1922 says that when ordering
parts it is neccessary to state the caliber of your gun so....don't know.
I have one Browning 1910 in .380 and two old FN 1910s in .32 acp
so I may get all three of them out someday and find out.