My dad has Single Shot Rifles and Actions, the next one to get is Mr.
Single Shot's Book of Rifle Plans

http://dehaas.com/guns/

"To inquire about or purchase muzzle-loading gun barrels for rifles,
pistols and shotguns, or to purchase any of the books written by Frank
DeHaas and featured here, contact Mark DeHaas at (660) 872-6308."


wrote:
If single shots are your thing, read some of Frank de Haas' books,
he's got some tips on what to use for what parts.