Larger short rimfire cartridge found this morning

[tamrock]

Found about an hour ago walking the dogs in the field. It's pretty mangled and has no back stamped as I was expecting when I rubbed off the rim. It's definitely made of copper. Length is roughly .6250 and diameter closest to the rim is .4687 give or take. I'm wondering how old and to what firearm it most likely was fired in?

 

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[NOLA_Ken]

The measurements you have are close but aren't quite a match to the .46 short rimfire for the Remington New Army conversions which is what I thought it might be at first. Those have a width of .458, a rim at .530, and a length of .836.

 

[pistol-pete]

Think you have a 56-56 Spencer carbine case. Made these up into the 1900's but no headstamp would be older. We need measurements in.001" to better ID it.

 

[tamrock]

Unfortunately I am unable to locate my accurate calipers and being so mangled up, they really wouldn't offer much more accuracy I'm thinking. The .46 short is most likely what I have as my little jiffy for a good guestimate calipers are reading a Cnt, hair over 13mm and the rim diameter of the .46 RF is 13.5mm The rim is the best undisturbed part of this old casing. I wonder if that hammer strike would be able to give a hint to what kind of gun was used? Not far from this find I found an old 45-70.