British type Minie on the far right.
And measured about 0.556" IIRC! Have tried some of those with little success so far. Haven't added the wooden base plug/iron cup trick on 'em, yet, though.
My Circa 1860 Tower short/Sergeant's rifle likes about 45-50 grs. 60grs and over loads just don't shoot well enough with standard Minies to consider for hunting. (Have photos in the camera of said but haven't seen the camera in some time, BTW. Probably in the pine scented hunting clothes box...) Same goes for the US rifled muskets I've shot. The only reproduction rifled musket I've ever tried was hopelessly inaccurate no matter what!