This non-magnetic Benet-primed or bar and anvil primed cartridge looks unusual. It came to me identified as a 56-52 Spencer. Please see photos.
The dimensions (inches) for the cartridge in the photos are:
BulletD: 0.527 (at case mouth)
First unusual thing is the cartridge is Benet-primed or bar and anvil primed and not a rimfire.
Second unusual thing, is the rim diameter is closer to the 50-70 (0.666") and its brothers (50 Cadet and 50 Carbine) than to the 56-52 cartridge (~0.626 to 0.639").
Third unusual thing, is the flat nose bullet. I have several Spencer cartridges and have seen numerous photos of them, but none have a flat nose bullet. Every Spencer cartridge I have seen has a conical bullet.
My questions are:
Is this really a 56-52 Spencer cartridge or is it someone’s reload or hybrid?
Was the 56-52 Spencer ever loaded as a Benet or bar and anvil primed cartridge?
Why is the rim diameter so much greater (0.023" to 0.036") than published 56-52 measurements? (Maybe the measurement difference isn’t all that great considering tolerance control back then and the need for reliable firearms using black powder?)
Was the 56-52 Spencer ever loaded with a flat nose bullet like the one in the photo?
Thank you for your thoughts.