Not long ago I had the opportunity to dig right through the middle of a old civil war foundry. The building long since gone but we knew where it was thereabouts. The yanks cast Minnie's and canon balls at the site. For your enjoyment here are a few Minnie's that haven't seen the light of day for over a 150 years. The ones on the left measure .680" and weigh in at 700gr. Those on the right are 570" and weigh 470gr.