More musket balls?

[drizzlermibs]

Awhile back I posted what ended up likely being a musket ball....I found a handful of a few more that are similar but don't seem quite as heavy. They vary in size from .59 to .65 (inches on a caliper); and are not attracted to a magnet. Are these musket balls as well? Thanks for any input.

 

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[Charlie P. (NY)]

They look like clay marbles. Did you find them with a metal detector?