.400 Corbon
The .400 Cor-Bon is an automatic pistol cartridge developed by Cor-Bon in 1997. It was created to match the ballistic performance of the 10mm Auto cartridge in a .45 ACP form factor. It is essentially a .45 ACP case, necked down to .40 caliber with a 25-degree shoulder.
History & Design
Peter Pi, founder of Cor-Bon and the designer of the .400 Corbon cartridge, explained his reason for developing the cartridge: "Velocity is the key to making hollowpoint bullets work. The added velocity assures that the hollowpoint will open up even if plugged with material. This reduces the risk of overpenetration and allows the action of the hollowpoint bullet to dump the available energy into the target."
Pi said that because he wanted the .400 Corbon to be easy for handloaders to make, he based the cartridge on the highly popular .45 ACP so that ample supply of cases was readily available. He gave the shoulder a 25-degree angle, and head-spaced it on the case shoulder rather than the mouth so that overall length is not critical and the bullet can utilize a roll crimp to avoid setback and to burn powder more efficiently.
Specifications
Parent case: .45 ACP
Case type: Rimless, bottleneck
Bullet diameter: .401 in (10.2 mm)
Neck diameter: .423 in (10.7 mm)
Shoulder diameter: .469 in (11.9 mm)
Base diameter: .470 in (11.9 mm)
Rim diameter: .471 in (12.0 mm)
Rim thickness: .050 in (1.3 mm)
Case length: .898 in (22.8 mm)
Overall length: 1.20 in (30 mm)
Rifling twist: 1:16
Primer type: small pistol/rifle
Ballistics
| Bullet Weight (gr) / Type | Velocity (f/s & m/s) | Energy (Ft lbs / Joules) |
|---|---|---|
| 135 gr (9 g) JHP | 1,400 ft/s (430 m/s) | 588 ft lbs (797 J) |
| 150 gr (10 g) JHP | 1,310 ft/s (400 m/s) | 572 ft lbs (776 J) |
| 165 gr (11 g) JHP | 1,250 ft/s (380 m/s) | 573 ft lbs (777 J) |
