Afro408 did.

It’s a sort of Fergusson rifle, hence the need for a chamber.

I need to source a place for .800 round ball mould. Anyone know where?

Also, what do you think of this for the lock choice? I’m not trying to style it after any particular gun or era. Also need to pick a butt plate.

https://www.trackofthewolf.com/Categories/PartDetail.aspx/724/1/LOCK-GA-FR