Measure the expander ball and see what diameter it is .398 or .408. At the least try a .41 magnum case in it (lubed, those are pre carbide) go slow and see what you come out with. Nothing ventured, nothing gained.
Most likely it is for the Magnum, but being non-carbide would make for a better display item than a useful set. You could also contact Lyman and ask.
RD
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