Who know something about bullets?

[MDmom2]

Here's my finds this morning. Who would think December 13th in Maine I'd still be digging. Anyone know much about bullets? What can you tell me about them? Two photos, same bullets front and back side:

 

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[Dr. Syn]

Yep, they appear to be bullets. That's about it for me.
Bottom 3 look to be more recent vintage, they look like jacketed versions. Top two, could be musket, mini ball, or maybe even shotgun slugs or plain old non jacketed rounds. Top one, first picture looks to have a protrusion in the center, maybe a muzzle loader round.

Guessing more then anything.