.400 Corbon
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The .400 Corbon is a relatively recently developed pistol cartridge. It is essentially a .45 ACP that has been necked down to .40 caliber. This round can be fired in nearly any pistol that can fire the .45 ACP round with only a drop-in barrel replacement. The .400 Corbon was created by Corbon to mimic the ballistics of the powerful 10mm Auto cartridge without the need to change the breech face.