.400 Cor-Bon Load Data & Reloading Guide

The 400 Cor-Bon is a high-performance pistol cartridge developed in the mid-1990s by Peter Pi, founder of Cor-Bon Ammunition. Originating from the popular 45 ACP case, the 400 Cor-Bon was designed to improve ballistic performance by necking the case down to accept a 0.400-inch (10mm) bullet. This modification allows the cartridge to achieve higher velocities while maintaining manageable recoil, bridging the gap between the traditional 45 ACP and the robust 10mm Auto.

Technically, the 400 Cor-Bon features a bottleneck case, which enhances feeding reliability in semi-automatic pistols and enables the use of heavier powders to increase muzzle velocity. The cartridge typically achieves muzzle velocities around 1,200 to 1,400 feet per second with standard 165-grain bullets, offering a significant increase in energy compared to standard 45 ACP loads. It is important for reloaders to adjust for the cartridge's increased chamber pressure and to ensure proper resizing to maintain reliable cycling and case durability.

Bullet weights for the 400 Cor-Bon generally range from 135 to 200 grains, with 140 to 165 grains being the most common for achieving optimal performance. This versatility makes the cartridge suitable for applications ranging from competitive shooting to personal defense. Although its popularity is somewhat niche, it is appreciated by enthusiasts seeking a balance of speed and power without stepping up to the full recoil of a 10mm Auto.

For reloaders, the 400 Cor-Bon presents an exciting opportunity to maximize performance through careful bullet and powder selection. Using standard 45 ACP cases as a base allows for easy conversion, reducing cost and increasing brass availability. Due to its relatively lower popularity, handloading becomes an economical way to experiment with load configurations to achieve specific ballistic goals, making the 400 Cor-Bon an intriguing choice for those looking to customize their shooting experience.