I bought a couple of WRACo 6mm Lee Navy FMJ cartridges a couple of weeks ago, and one had a cracked neck. I figured why not take the opportunity to see what’s inside?
I had read that the 6mm LN was loaded with Rifleite propellant, a powder originally developed for the .303 British, but (to my knowledge) never fielded with that cartridge. I have read some of the test reports of Rifleite, which suggested that it produced low velocities and high pressures, and from secondhand sources that it produced wildly inconsistent peak pressure, which (they said) probably accounted for the Winchester-Lee’s barrel life problems.
This is the powder, which I assume was Rifleite, that was loaded in my 6mm Lee Navy cartridge:
The bullet was stamped with a “W” both on the jacket:
And on the base of the lead core:
Here’s its undamaged companion: