RE: The History
Black powder and patched roundball for hundreds of years.
Matchlock util themid 1600'sor so and then flintlock until the 1830-40'sand Patched Roundball up until theabout the1830-40's when the percussion cap & conical was developed for small arms.
The conical was more wide spread post the development of percussion ignitions and really adopted wide-spreadduring the civil war era.
The ball-et I think is a 19th century projectile and the sabot for ML's is certainly a 19th century projectile.