Does anyone know of, and preferably have a picture of a properly headstamped (showing the maker and caliber) experimental .41 Colt Automatic Pistol cartridge? Very few of the pistols, a converted Model 1902 Colt re-designated the Model 1903, were made in that year. The highest serial number known is “5.” A picture of the cartridge exists, typical of Winchester catalog art but is not shown in any Winchester Catalog of which I am aware. The headstamp on the cartridge as it appears on that drawing is “W.R.A.Co. 41 CA.”
I have a NUPE cartridge of the .41 Colt Auto (Official Designation as stamped on the pistols was “Caliber 41 Rimless Smokeless” even though the cartridge is semi-rimmed, indicating a likely John Browning design). However, my Boxer-Primer type case is unheadstamped. It was reported to be a copy of the cartridge prepared by or for the H.P. White Laboratory. Considering the era when the pistol was designed and manufactured, I cannot think of a reason why the H.P. White Lab would bother with such a product. Further the case looks like it is of drawn brass. This would, to me, indicate more than the production of simply a few “lab specimen” years after the project was history. Can anyone confirm, with documentation, that the unheadstamped cases are actually a product for or of H.P. White Lab?
Measurements of my case are as follows:
Case Length: 0.8920" (22.69 mm)
Case Head Diameter: 0.4185" (10.62 mm)
Extractor Groove Diameter: 0.3266" (9.30 mm)
Base Diameter: 0.4045" (10.27 mm)
Case Mouth Diameter: 0.405" to 0.409" (10.29 mm to 10.39 mm) (note: The case mouth appears to have been slightly squeezed into a oval shape, albeit minor. Thickness of the case mouth wall is only 0.135" (0.45 mm).
Primer Pocket Diameter: 0.1710" (4.34 mm)