Here is some interesting information. A.H. Fox in the 1920s produced the Super Fox guns for long range waterfowling, a sport where delivering a small pattern of shot at a distance was every bit as important as in driven pheasant shooting. A large amount of work went into boring and choking barrels to throw tight full patterns. The 12 gauge guns were initially bored to 0.750. Further testing led them to settle on a bore of 0.740 with 3/4" forcing cones (long for the day) and 4.5" chokes with a 1" parallel. The 20 gauge guns were bored 0.624, had the same forcing cones and 3.5" chokes. Choke configuration was, and is, important in producing tight patterns. This was all done with fiber wads. The full choked guns were renowned for the ability to throw 78-80% patterns at 40 yards with factory Winchester Super-X ammunition.
Regards
Jeff
