As you'll see on page 4 of the document I provided you the 9x18 Police cartridge is a tapered case from top to bottom and was actually the replacement for the original "straight cased" 9x18 Ultra. .21mm's wider at the bottom than at the top to be exact. The 9x17 Browning (.380 acp) is a straight case top to bottom measuring in at 9.5mm's. In short, the reason one can reload the 9x18 Police with a 9x19 Parabellum die set using a .380 acp shell holder is because they're tapered cases and dimensions extremely close. I successfully reload the 9x18 Police round this way a lot! Side note: I've managed to obtain some original 9x18 Ultra ammo which has a straight case O.D. dimension matching the .380 acp. I'm going to see if it works in a P232 magazine once it arrives!Dimensionally, they appear identical, and the .380 mags will seat and lock back the slide in the 9x18 pistol. What happens with ammo, Michael?
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