About 27 flattened lead discs were found in the excavations of a 1880-1989 military fort/ 1900-1910 Indian boarding school.  Seen here: http://www.flickr.com/photos/76291042@N08/6843318859/in/photostream

Most were found in one particular unit near the back of one of the military barracks where there may have been a shed during some period.  They were found in levels associated with both the military and boarding school.  They look like lead bullets which had been flattened, perhaps being shot against a hard surface.  They were all found very close to the buildings and far from the known target shooting area.  It's unlikely anyone would have been shooting so close to the buildings.  Could they have been picked up for melting and recasting?   There was a blacksmith shop for the fort and the boarding school and it was no where near the buildings excavated.  There were also some other lead fragments found, pieces of what looks like lead waste and more fragmentary versions of the lead discs.  Would anyone be melting down lead in a shed when a blacksmith shop was available?

Any ideas?  Has anyone seen something similar?

Thanks.