Most common Lugers are either
(9mm Parabellum) and (.30 cal. or 7.65mm Parabellum), and there were a VERY VERY few that were made to fire .45 ACP, but that's another story [img]biggrin.gif[/img]
If a 9mm Luger (parabellum) cartridge will chamber then that is the caliber of your Luger. The bore is large enough on a 9mm Luger that if you take a .30 caliber Luger cartridge and place it bullet first in the muzzle, then the bottleneck portion of the case will fit into the bore without a problem... ( this isn't the proper way of loading your Luger... we are just determining the caliber [img]biggrin.gif[/img] )
if it won't easily fit in this manner, then you have a .30 caliber Luger and a 9mm won't chamber at all.
You should be able to use any 9mm ammunition that is not specifically marked for use in submachineguns (or maybe +P) without being concerned about excessive pressure.
All Lugers were designed for smokeless (modern) powder.
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regards, -John S
"...We hold these truths to be self-evident that ALL men are created EQUAL and are endowed by their Creator with certain UNALIENABLE rights, and among these are life, LIBERTY, and the pursuit of happiness..."
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