This was found at a site (A creek) where lots of civil war ammunition was found. It has the same shape, size and weight of a bullet, but it has a kind of iron casing on the outside. on the base, you can see the lead showing. Any help is appreciated! Thanks
Modern jacketed bullet, perhaps .45 or so depending on exact dimensions. Your last photo pretty much nailed the general ID with the lead core inside a jacket.
I have found one in a very small civil war skirmish area also. It does appear about .45 caliber, but it is a ferrous jacket you can see it stuck to magnet. Also highly rusted, right in among single ringers and some spent henry rounds.