Thanks for the reply, Bob. Given the Large barrels in the stash, I was wondering if the original barrels might have been re-bored by Mr. Large. In any event, they were nicely done.
The barrels were found in the attic of a home inherited by the grandson of one of the guys I used to shoot with. My old friend had more than a bit of packrat in him: he bought barrels and parts when he got a good deal, then tucked them away "for a rainy day". He told me once of visiting Friendship (sometime in the '60s I think) and buying 9-10 barrels from the trunk of Bill Large's car (probably in the late '60s).
The barrels were all drenched with Cosmoline, wrapped in newspapers, and tucked away since at least 1988. I used a razorblade scraper to take off the paper to see makers' stamps, and a tape measure to get rough measurements on several before making an offer on the lot. I haven't had time to get any further in cleaning the barrels up.
The Large barrels I measured were:
.54 (probably) 44"x 1 1/16", percussion breech;
.69 (11/16") 38", 1 1/8"+ at breech, 1 1/16" muzzle, flint breech;
.38 (3/8") 50" x 1 5/16", flint breech.
Jim