Thanks very much for the 'parts' rundown, Steve. What a 'big' project!
: Any idea what powder charges will be used, Bigdog?
; A full charge for a 4 bore is 16 drams - that's 436.8gr. That would be a starting to moderate load for a 2 bore and one that might not be advisable for shooting from the shoulder. Got a wheeled carriage in mind for that beast? :0