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I'd hate to guess on that cm. Maybe someone else with more expertise will be able to answer your question. I don't have a handbook like that on bullets. Have you seen this chart?Looks most like and closest to measurements of .50 cal Smiths in Thomas & Thomas Handbook #73 that shows D .524 and L .86 for my 1st bullet. What about the second one its 3 ringer solid base?
Wow, that really pinpoints that it was the Union Cavalry who fired those shots. That is cool. Congrats. I bet if you tried, you could narrow it down to a couple units.