Yes! Great find, fuhrmann.
Just over a 70" twist speaks strongly of an elongated bullet, of course.
22.2 to 22.3mm is .0223meters, is about .81 to .88 in calibre - close.

Colonel Jacob - (Englishman) was experimenting in those furry days of technical advancement for military purposes. This was prior to 1850 and concerned a side by side rifle of approximately .60 cal, that shot a 'winged' ball (bullet with long 'wings' that fit the 2 and then later a 4 groove barrel. His bullets were of the explosive type. His DR was sighted to 2,000 yards with a high ladder sight. It is said he blew up an ammunition wagon at extremely long range - 1,000 (or more) yards? Of course to have any hope of hitting at that range, the barrels HAD to shoot parallel - no other regulation could possibly work.

Effective - they thought so or would not have designed and used such 'artillery'. On a wall, the breech loader would be so much handier than the muzzle loader.