Bullet Identification?

[Dylanger22]

Wondering if anyone can help identify this bullet? I'm thinking it's a .45, but also appears copper, and I know copper jackets didn't come along until the 1880s. (Found amongst an 1870s battle site) Any feedback would be sweet! I feel it's way modern tho

 

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[Dylanger22]

Wondering if anyone can help identify this bullet? I'm thinking it's a .45, but also appears copper, and I know copper jackets didn't come along until the 1880s. (Found amongst an 1870s battle site) Any feedback would be sweet! I feel it's way modern tho View attachment 1983197

 

[crashbandicoot]

Need to know the diameter and weight at least to be sure on caliber,but definitely modern.I,d hazard a guess as a .44 or .45 jacketed hollow point.