I got to fiddling with a ruler, as well as my blocked open AA hull and a dial caliper, and best as I can measure,the chamber is a tiny bit short of 2 3/4". The AA Hull measures almost exactly 68mm, so, the chamber is short of the full 70mm that should mean a 2 3/4", but long(ish) for a 2 1/2".
That does not take into account, the variances and "extra" room, that would have been allowed for in the chambering, to cover the eventuality of different length cartridges.
I expect that this means that the chamber is indeed a correct 2 1/2" chamber and unmolested, and that there should be not much to worry about, provided that I can keep it from falling into the hands of those that believe "more is better" and would load it up with high brass steel shot goose loads <shudder>.
Must get the hole gauges into the chamber, and get a measurement of the diameter, and make a decent fitting plug, or sort out my supply of low temp alloy, and make a cast of the chamber.
I was digging around the past posts here and saw the rebuild done to an A&N by a gent from Ontario. WOW!
Cheers
Trev
