Lefever Arms Co stated they "Originated & Perfected" the taper system of boring. It appears the ad writer for Sears/Meriden may have been reading LAC catalogs & then went just a "Notch" higher. LAC only guaranteed 75% patterns "With all Sizes of Shot". All of the "Taper Chokes" I have had opportunity to measure were a continuous taper for the length of "The Choke" not the length of the barrel. Full choke on my Lefevers run around 4", which is longer than most Conical/Parallel chokes. A late (1946) L C Smith drawing shows a cone length for the choke of 1 9/16" & a parallel of 1", thus a total length of 2 9/16".
Note that in a LAC catalog with price list dated Jan 1, 1889 they stated their full choke would place 75% of all sizes of "Drop Shot" from #8 to FF in a 30" circle at 40 yds. They were already using the Taper Choke at that date.
