Here's mine made by my brother however this site's Steve Zihn, will build you a wonderful Sporting Rifle, Purdey style, if that's what you want - in caplock.

Were I to have another, it would be a 16 bore - not a 14 bore(482gr. ball at .682").

The Ed Rayle barrels are bored 15 guage to use a true 16 bore ball(.662"- Lyman mould), which in pure lead, weighs an even ounce.

The 14 bore does stagger moose with a broadside lung shot.
]f you want a kit, try Jim Chambers and perhaps he can suggest or alter his earlier flint English Gentleman's Rifle kit for caplock if that's what you want. Jim's kits are not for beginers to building, though. He uses top-quality parts, but the kit comes in only up to .62 calibre(just over 20 bore) Further changes might be made- so ti's worth a call.