I've had this cartridge for a long time an never knew what it was. The diamiter of the projectile is 7mm. The diamiter of the casing is 8mm. The length of the casing is 12mm. The length of the cartridge overall is 23mm. It's rimmed like a revolver cartridge and is centerfire. No markings. Looks like some kind of cap seeing as how (counting the part inside) the bullet is longer than the casing. In the pic, it's the gray one in the middle(9x19mm left & ,22lr right).

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