A quick means of checking to see if the bore is .30 caliber is to take a loaded cartridge from your box of Super-X .30 Luger loads and insert the bullet into the muzzle. If the bullet is stopped from entering all the way by the lands, it's a .30 caliber bore. If it's a 9mm, the .30 caliber bullet AND neck of the cartridge will go in until stopped by the shoulder of the case.
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