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The Mossberg 590 holds 8 shells in the magazine plus 1 shell in the chamber for a total of 9 shells. This is when using 2 3/4 inch shells. Reduce the capacity by 1 when using 3 inch shells. The 8 shot Model 500 Persuader holds 7 in the magazine and 1 in the chamber for a total of 8 shells.
9x19, 9mm NATO, 9mm Luger, 9mm para, 9mm parabellum are also all the same thing, but NOT the same as the above. Source(s): ADDED: the Astra 400 is a 9mm largo, which is obscure and this specific gun can shoot .380 acp. it is NOT a recommended practice. There is an Astra 300 chambered in a .380.