rifle cartridge ID

[unclemac]

Looks to be an old center fire cartridge but no markings of any kind on the bottom, a bit smaller than a dime as you can see.
The rim flange is very pronounced...seems a lot bigger than anything I am familiar with. I found it with the stick shoved in it as you see, which probably saved it as it is paper thin with age and wear.

Any idea?...found on the west coast.

 

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[TheCannonballGuy]

It appears to be a cartridge-casing made in the 1870s for the Springfield .50-70 Rifle ...but measurement of the casing's diameter in hundredths-of-an-inch is needed for certainty in identifying it.

 

[unclemac]

thanks, hadn't seen it before.

 

[BosnMate]

I owned a 50-70 at one time, and from what I can tell in the photo, I think the case is a little long for a .50. The extra .005 inch really shortened the case when filled with 70 grains of powder. If it's a .50 caliber, it could be a .50-90 Sharps. Need measurements or just guessing from a photo.