Does anyone here know what the Husqvarna factory specs were for 12 and 16 gauge bore diameters, as well as choke constrictions? Were they constant over Husqvarna production, or did they vary over the years?

I ask because I keep finding 16 gauge barrels 0,005 to 0,015 inches over nominal modern standard of 0,662. Perhaps they were all reamed lightly -- I cannot exclude this -- but, I am begining to wonder.

Thanks,
Niklas