I didn't make this, but a gun crank I used to shoot BPCR with made it for me. Not sure where he got the design or if he dreamed it up himself, but it works great and will work for any 45 cal straight wall brass up to a bit over 3" long. Not as purty as the boxes presented prior to this post, nor is it "PC" (if that's even important).
DECAPPER for field use . . .