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

 

[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.