.429 DE

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

[2][3] The .429 DE is a .50 AE case that is necked down to accept .429-diameter (10.9mm) bullets used in the .44 Magnum.

[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.

[2] The same bolt and magazines can be used with both the .429 DE and the .50 AE-chambered Desert Eagle.