[2] It was created to mimic the ballistics of the 10 mm Auto cartridge in a .45 ACP form factor.

This reduces the risk of overpenetration and allows the action of the hollowpoint bullet to dump the available energy into the target.

"[3] Pi said because he wanted the .400 Corbon to be easy for handloaders to make, he based the cartridge on the ubiquitous .45 ACP so that an ample supply of cases was readily available, gave the shoulder a 25-degree angle, and head-spaced it on the case shoulder rather than the mouth so that over-all-length is not critical and the bullet can take a tight roll crimp to avoid setback and to get a more efficient powder burn.

[5] Because of its relatively high velocity for a handgun round, the .400 Corbon offers a very flat trajectory, which in turn allows the firearms chambered for it more effective range.

Handloaders have worked up safe loads using 180 gr (12 g) bullets at 1,250 ft/s (380 m/s) making it an adequate round for hunting some medium game at close distances.

[9][14][15] The .400 Corbon also surpasses the Steel Challenge Shooting Association's stop plate's power actor floor of 120 and qualifies for metallic silhouette Big Bore Competition under IHMSA rules.

JHP "penetrates an ideal 12.3 inches (310 mm) of gelatin" and "should be a 92-percent stopper, per the Fuller Index.

Test results concluded no adverse affect [sic] from switching to small primer pocket.

[26] Nearly any .45 ACP pistol can be converted to utilize the .400 Cor-Bon cartridge with only a drop-in replacement barrel, and sometimes a heavier recoil spring (for 1911s this is usually an 18-20 lb.

[7][27] Suitable recoil springs are easily installed when changing barrels and readily available from many gun parts suppliers, including Wolff Gunsprings.

You don't need extra-heavy springs or tricked-out guns for this round -- just drop a .400 Cor-Bon barrel in your favorite .45 and you are good to go.