I am having a bit of trouble with my old worn out eyes reading the diameters. Is one barrel marked 16.o & the other 15.9 or does each barrel carry both diameter markings. If the former then the mark indicates the dia of that particular barrel & it was choked to at least .2mm (about .008") but could well be considerably more.
If the later then the smaller number would indicate bore dia at provisional proof & the larger the bore size after final finishing for definitive proof. Choke would be same as above.
Earlier Belgian proof did indicate both bore & choke diameters but this had been discontinued.
Miller/TN
Miller,
One barrel shows "16.0 CHOKE 15.9" and the other barrel merely states "CHOKE 15.9"
