So, I was going through some of my boxes of brass and misc. collected stuff, and I stumbled on a couple of cartridge boxes that are marked in black marker - ".303 Brit.". When I open them, it's obvious that the empty cases inside may have started life as .303 British (as they are headstamped), but they are now a tapered case, with no shoulder.
I've gone through my "Cartridges of the World" but can't seem to come up with anything that really matches.
The dimensions are:
Rim dia. .525
Neck dia. .410
Case length 2.145
and about .388 inside the case mouth
They actually appear to have been fireformed, as there is a .165" tall band around the base, that measures @ .003 smaller than the brass above. It looks like something (tape or something similar) was wrapped around the base, just above the rim, and kept it from expanding as much as the case just above. Maybe to center it in the chamber?
Just curious, and thought that I would throw it out here for thoughts and opinions!
Don