I wish that people would give some measurements when asking to id bullets and/or cases
Nevertheless, your bullet looks like a 3-ring minie from civil war era. As for the exact age, impossible to say. Even modern day black powder shooters may use such bullets. Imho your bullet does look old so I'd be inclined to say civil war era.
Thanks Voriax! The bottom has a cavity. Here's another scan. Is there any way to have its age verified? If it is a 3-ring minie, what would the caliber be - 50?
Caliber might be .54 Hard to tell from that ruler. If you have a caliper measure you could take & post accurate dimensions. Also you can browse this page: http://www.civilwaroutpost.com/Bullets.htm and decide yourself