Load 9x19 using 9x18 Dies?

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the bullets are different diameters, so my guess is NO. It is more than just a difference in case length.
 
Yep. The Wundernine, aka 9mm Parabellum, aka 9x19, is .355. It also has a tapered case. The 9mm Makaraov, aka 9x18, is .365 (mas o menos, depending on who's making the gun), and is a straight-wall case.

Conclusion: don't do it.

cf. Wikipedia article: "Although the nominal calibre was 9.0mm, the actual bullet was 9.3mm in diameter, being shorter and wider and thus incompatible with pistols chambered for 9x19mm Parabellum cartridges."
 
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