.236 U.S.N. cartridge by WRA


#1

Are 6 m/m Lee Navy cartridges by WRA with the caliber indicated in the inch system of early manufacture? The one in hand is loaded with a full patch bullet having a jacket of tinned copper. The primer is crimped. Jack


#2

If you are referring to the rimless USN cartridge, ‘YES’. WRA Co. actually cataloged a rimmed version of the .236 USN in the mid 1890s. They did not manufacture a commercially available rifle for it, but did list the cartridge from 1894 to 1896.


#3

There are 4 different case types.
Rimmed and rimless. However you can find rimmed cases with the sharper rimless (6mm) shoulder and rimless cases with the longer rimmed (236) shoulder.
Examples exist in U.M.C.Co. and in W.R.A.Co. product.


#4

Roundsworth and Pete: Thanks for your replies and information. I meant the standard rimless cartridge as produced commercially. Incidentally, I see on the Wikipedia that the rimless version is described as both “semirimmed” and “semirimless.” It looks like someone (or more than one) thought because the .220 Swift was semirimmed and derived from the 6 m/m Lee Navy the original cartridge was semirimmed also. Jack


#5

The .220 Swift was basically derived from the Rimless 6mm/.236 Lee, but to fit the 30/06 Bolt head of the Springfield and M17 rifles, hence the .470" diameter “semi-rim”. For the time ( 1920s) it was the ideal High Velocity small calibre cartridge suited for a full-sized ( ie Service Rifle) action, necessitating only a barrel change without any work to Bolt or magazine.
BY the 1920s, Powder improvements had eliminated the erosion and pressure problems of the original M95 6mm cartridge.
]
The 6mm Lee Navy can be said to be a design before its time, handicapped by in-efficient powder, and metallurgical lack of knowldge.

ON another tack, the Belgians (Nagant Freres) also experimented with variations of the 6mm Lee cartridge, in 6mm, 6,5mm and 8mm, in the 1890s.
Some of these were also semi-rimmed. That is the core of another full thread for some one to expand on.

Regards,
Doc AV