Mostly .57, just depends on where your from. Here, have found lots of removed flash pans off flintlocks that were converted to cap locks. Plus a lot of .69 & .72 Minnie's and round balls. You also find .32, .40, .45, .50 & .54 bullets and balls. They used everything around here. Lolnitestalker said:When have you ever seen a musket without a marked lock plate. The butt plate in not inleted. This single throat hammer on a Brown Bess.
Mini Balls were not used in smooth bore flint locks. The Mini was a Civil War era bullet for rifles. These were expanding base conicals mostly .570 Cal.