Mystery cartridge, anyone care to let me in on the secret?

[Pulp]

I was going through a tin of old cartridges tonight and found this. I never knew what it was, hopefully I will know by tomorrow.

It measures 0.542 just above the rim, 0.450 at the neck, and the bullet is 0.425. First guess would be a rimfire, but it could be an internally primed cartridge. The early .45Colts did not have a visible primer.

 

[Okie4570]

Bad timing on my part, I've got my Cartridges of the World loaned out!

 

[264Magnum]

My first thought was a Peabody, bottom right, but the dimensions don't jive. And they're not rimfires, so...

 

[Shadowrider]

.41 Swiss?

 

[SMS]

.41 Swiss Rimfire?

http://www.gunauction.com/buy/10260...rounds-of-.41-swiss-rimfire-ammo-lb-headstamp

 

[NikatKimber]

.41 Swiss?

http://www.swissrifles.com/ammo/#10.4

 

[AKguy1985]

I was gonna say swiss.

 

[aeropb]

how bizarre