Checked the LGS a few days ago and looked like somebody had turned in a pile of casting material. These were part of the bunch.
HYTIN UMB and Imperial. They "tink" too much to be pure lead I think. Couldn't find anything at all in a search.
I know it's a shot in the dark, but figgered I'd take a shot at $25 for the lot.. Got lead, light on hardner. d:^)