Spencer bullet?? I found this at a old fort site est in 1850

[jimzz977]

 

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[villagenut]

Could be a S&W model 1 .22 cal or a model 2 .32 cal. Early rimfires had no headstamp. No measurements make it guesswork.

 

[Davers]

I agree ..it looks like a 22. rimfire , but could be larger , I have dug 22 bullet's from a Calvary camp , & hope I saved the "short" cases .

Nice complete cartridge to find . Also it's cool to see yr site is still giving up relics .