There was a lengthy article on the 32-gauge/14 mm by James Vance M.D., F.A.C.S. in the September 1933, issue of The American Rifleman. The author had a svelt straight-gripped Lancaster double with 30-inch barrels.
Unfortunately for the 32-gauge, three issues earlier they had the introduction of the Winchester Model 42 and the 3-inch .410-bore shell!!