No civil war activity here I'm afraid. Eastern Canada. The french burned out nearby towns 3 times about 1700, nasty buggers. They attacked in winter and burned everything standing. The winter population was small (much of the activity was seasonal and most went back to England in the fall - fog birds) and some places where deserted and the french where fast and brutal from overland, most defences faced the sea. Only one group of settlers escaped capture on an island with their valuables but the rest where rounded up and shipped back to England. There are a few places where the prisoners where kept prior to removal but those are hard to get to. The inland tracks could have gone anywhere in the depths of winter, 300 years later it would be a challenging job to check out possible routes althought where they came from is a well known fortress placed on land granted them by an English king, silly bugger too. Give a land grant near your settlements to an enemy.
My best quess i thatt this belonged to some fisherman settler who owned a surplus brown bess, we have found several butt plates from the India Pattern Brown Bess ca. 1795-1830. Lots where made and a lot of surplus ended up on the east coast. These fishermen cast fishing weights from lead and lead splatter and pieces, sheet and chunk are about the most common item we find.
I have not seen a mold before this one. Most molds appear to have been made of soaked wood which could be easily made but not for musket balls which require precision.
1859
