.429 DE

.429 DE
.429 DE
Type	Pistol
Place of origin	United States
Production history
Designer	Jim Tertin
Designed	2018
Manufacturer	Magnum Research
Produced	2018–present
Specifications
Parent case	.50 AE
Case type	Rebated, bottleneck
Bullet diameter	.429 in (10.9 mm)
Case length	(33 mm)
Primer type	Large pistol magnum
Maximum pressure (SAAMI)	46,000 psi (317 MPa)
Ballistic performance
	Test barrel length: 6 inches

The .429 DE (10.9x33mmRB) is a cartridge introduced in 2018 by Magnum Research for the Desert Eagle line of handguns.^[2]^[3]

Design

The .429 DE is a .50 AE case that is necked down to accept .429-diameter (10.9mm) bullets used in the .44 Magnum. The cartridge features a 25% increase in velocity and 45% increase of energy over a standard 240-grain .44 Magnum load of 1,285 ft⋅lbf (1,742 J) at 100 yd (91 m).^[2] The .429 DE offers increased speed and accuracy over the .50 AE due to its lighter and slimmer projectile. Also, due to its use of the same cartridge design, one can easily convert a .50 AE Desert Eagle to .429 DE with only a barrel change. Though very similar to the obsolete .440 Cor-Bon, it is not interchangeable with that cartridge.^[2] The same bolt and magazines can be used with both the .429 DE and the .50 AE-chambered Desert Eagle.^[4] In 2021, the .429 DE was accepted into SAAMI standardization.^[5]