Gil and anybody else: Send me an email email@example.com and I'll send you "Making Double Shotgun Barrels" by A.P. Curtis in the November 1937 American Rifleman
Please let us know if you figure out how the fellas at Meriden Firearms did this with the "choke bored on the taper system"!!
1908 Sears, Roebuck & Co., Chicago, Ill. Catalogue No. 117:
"Shooting qualities- As before explained, the shooting qualities of these guns are unequaled for long distance killing, long range shooting, for penetration, pattern or target. Both barrels are full choke bore, so firmly constructed that unlike other guns, there is no recoil or kicking
. That which in other guns goes into recoil in the A J Aubrey gun goes to give greater force to the shot."