22.8mm(.8976") right between 7(.873")and 6 (.919") considering your measurements id say 22.8mm is definitely the bore size neither 6bore nor 7 bore. Super common
No name Belgian guns were sold prolifically through the gun trade, and they certainly prioritized low cost and high manufacturing amounts over adhering to strict tolerances and standardizations of the American or English gun market. The result? we have loads of 19th century, Belgian trade guns that don't adhere to the 1 2 3 4 5 6 7 8 9 10 11 12, etc. Etc, gauge sizes, there were plenty of half gauge or in-between gauge guns sold out of Belgium and many other countries in fact.
The good news is 6 guage Fibre cushion and overshot cards at .935" will still slide down those barrels. I wouldn't bother using the nitro cards they'd be too hard to load.
Its a shame we have ten gauge max here for turkey hunting, a gun like this would be a turkey thumpin sun uva gun!!!
Best of luck with the sale ed!
Last edited by SeñorCasualidad; 05/04/26 08:05 PM.
