Gun is Belgian and barrel markings indicate post 1930 manufacture. Same source indicated that the 28 gauge guns were
proofed for 21.25 gram loads--which appear to be 3/4 ounce.

Were 65 mm chambers designed for 3/4 ounce loads [per the 21.25g statement] or something else?

Many thanks


PULL!
Hal M. Hare