My first 16ga was a Baker and it had 2&9/16" chambers. I made a gauge(on the Baker demensions) to check other guns I came across for their length and the first I found was a 16ga Fulton. My gauge showed it even had a shorter chamber than the Baker, but it was actually the chamber diameter and the taper not the length. The Fulton was 2&3/4".
Odds are very strong that the Fulton's chambers have been lengthened if it measured 2 3/4". Hunter Arms 16's were 2 9/16" until about 1940. They were one of the last American makers (if not THE last) to go to 2 3/4" as the standard in 16ga guns.
