Please let me know if you can identify this projectile or the era. You'll see it's rounded at top and hollow back, around the size and shape of a very thick/fat thumb, but not as long. I live in Rev. war area of NY. It may be lead, but is not as weathered as the musketballs I find here. Liberty Quarter found elsewhere (just for size). Thanks very much. I found one other of these and a couple flattened ones.