Rimfire cartridge

[toasted]

Found this at a late 19th century site. This and the fact that the only mark on the head of the round is on the rim

 

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[d2]

Looks like one to me...d2

 

[jewelerguy]

it's got double firing pin marks. possibly a Henry rifle cartridge?

 

[BosnMate]

it's got double firing pin marks. possibly a Henry rifle cartridge?

Round firing pin as opposed to rectangular firing pins should help identify the gun. The Henry had double rectangular firing pins. I forget what had the round ones.