I will give you my "opinion", so if I am wrong hopefully some one will speak up. Those look like post civil war bullets, probably modern black powder loads.
This bullet was sold as a modern three ring Minie ball, what you have has a different grove in it, but your bullets look to be fired.
They almost look like unfired British Snider Enfields. They might be if there is a flat round wooden base inside them. What throws me off though is that flat nose on them. I have dug round nosed and hollow point Sniders.
Size is very important. I have hand loaded 38's with bullets that look a lot like that. But without measurements to 1/1000 of an inch, your guess is as good as mine.
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