Developed by Winchester in the 1960’s and registered with SAAMI on 7/1/1965. It utilized a 200 grain jacketed soft point projectile. Was developed for the M1894 Winchester action to enhance the performance of available cartridges. The cartridge was never commercialized and only unheadstamped original versions were produced by Winchester.
The middle version is a dummy and the third version was made by Ken Stewart in South Africa.
.408 Winchester Dimensions | Inches | Millimeters |
Bullet Diameter | .400 | 10.2 |
Rim Diameter | .506 | 12.9 |
Base Diameter | .446 | 11.3 |
Case Mouth Diameter | .430 | 10.9 |
Case Length | 2.030 | 51.6 |