I have two rifles with Large BBLs. They are 2 of my Civil War Skirmish Guns, that I made. One is an 1862 Fayetteville rifle, with a 33 in BBL, 7 lands, and grooves, with a .575 bore, 1in 48 twist. The other is a Richmond Carbine, same BBL, only 25inch.
They Both shoot better than me.
A fellow skirmisher from the Detroit area use to get BBL blancks from Large, and make Civil War Gun BBLs out of them. His name was Jerry Harmon. He made great BBLs with the Large blancks.
Dave