Great example of the genre. Ejector too: nice!

"War and Peace" on the barrel flats!

Boswell must have had an energetic engraver on staff as most Boswells I have seen are well embellished.

Do you have a source of 2 1/2 inch cartridges, or do you intend to roll your own?
My Rigby sidelock is 2 1/2 inch chambered and I use a vintage bench-clamped tool from the golden era to roll-crimp onto a nitro card covering an ounce of bismuth shot.
The ~140 year old tool works better than my modern roll-crimper in the drill press!
Heaps better!!