If you have some of the original ammunition, the caliber determination is easy... even if the caliber is not on the headstamp of the cartridges...
If the cartridge is bottle-necked and the bullet is no where near the case head in size, then it is .30 caliber or 7.65mm, if the case is not a bottle-neck, then it is a 9mm.
A 9mm cartridge will NOT fit in a .30 caliber Luger chamber...
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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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