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400 Cor Bon

New drawing Coming

Introduced by Cor-Bon CEO, Peter Pi, in 1997, the 400 Cor-Bon uses a necked-down, 40-caliber, version of the 45 Automatic case to duplicate 10mm Automatic ballistics using less pressure and with a cartridge design that encourages dependable action cycling.

Having shot several of the original pistols extensively, I can attest to just how pleasant and dependable those guns are.

As a left-handed shooter, I can make most semi-automatic pistols jam without trying too hard! The day I got to shoot those pistols, I managed to force jams in half-a-dozen high-end custom pistols built by world-renowned pistol-smiths, guns the owners swore never had jammed and never would jam.

By jamming one custom Browning Highpower eight times while trying to empty one magazine, I brought tears to the owner’s eyes. So, noting I could not make the 400 pistols malfunction is no faint praise.


This cartridge does exactly what the designer set out to do. It is a great option for those who insist on maximum dependability and who will appreciate 10mm performance with significantly less muzzle blast.

As with any bottlenecked pistol round, best practice is to apply a roll-crimp after seating the bullet. This helps to lock the bullet in place against chambering forces that might otherwise drive it into the case. I cannot too-strongly recommend getting a second seating-and-crimping die so you can have one adjusted to seat the bullet and the second adjusted to only crimp the case mouth. Generally, attempting to do both operations in one step is a recipe for damaged and destroyed cases.


The text associated with the cartridge description reflects opinions and conclusions of the author, M.L. (Mic) McPherson. Lee Precision and its employees do not necessarily either agree or disagree with any of his comments. We present these with due deference to his recognized expertise in the firearms field. His acumen extends to handloading and all aspects of ballistics - internal, external, and terminal.
Die Sets
Lee Collet Necksizing 2-Die Set
Lee Full-Length Sizing Die Set
90430 (3-Die set)
Lee Breech Lock Die Set
Lee Loader
Single Dies
Full-Length Sizing Die
Steel Sizing Die
91218
Undersize Sizing Die
Powder through Expanding Die
91155
Charging Die
Seating Die
91195
Factory Crimp Die
90173 (Collet Style)
Taper Crimp Die
Inline Bullet Feed Die
Die Accessories
Guided Decapper
Case Conditioning Tools
Case Length Gauge and Shell Holder
Quick Trim Die
Presses
Reloader Press (50 RPH)
Hand Press (50 RPH)
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Classic Cast Press (50 RPH)
Value Turret Press (250 RPH)
Classic Turret Press (250 RPH)
Ultimate Turret Press (250 RPH)
Pro 1000 Press (500+ RPH)
Pro 4000 Press (500+ RPH)
Six Pack Pro Press (500+ RPH)
Shell Plates and Holders
Priming Tool Shell Holder
90202 (#2)
Universal Press Shell Holder
90519 (R2)
X-Press Shell Holder (APP)
91535 (#2)
Pro 1000 Shell Plate
90652 (#2)
Auto Breech | Pro 4000 Shell Plate
90584 (2)
Six Pack Pro Shell Plate
91836 (2L)
Inline Bullet Feed
Inline Bullet Feed Die
Inline Bullet Feed Kit
Inline Bullet Feed Magazine
Bullet Casting
Classic Bullet Sizing Kit
Breech Lock Bullet Sizer and Punch
Bullet Molds

Challenger III

From $117.00

Ultimate Turret Press

From $320.00

Deluxe APP Press Kit

91898

The Lee Deluxe Automatic Processing Press gives you the same priming convenience found only on expensive progressive reloading presses.

$155.00

Six Pack Pro Press

From $400.00