A 1898 12g Lefever G was choked .027 right with 3" of choke taper; left .036 with 4".
An occasional Lefever 12 gauge has bores tapering from the breech to the muzzle (.756 to .708 and .715 courtesy of Daryl Hallquist), some have a parallel bore and choke taper of 4 inches, and others a standard 2 – 2 1/2 inch taper.
Using 1 1/8 oz. of No. 8 chilled shot (449 pellets) Lefever claimed a 77% pattern in a 30” circle at 40 yards using a full choke.
See "Shotgun Review" in the 1912
Hunter-Trader-Trapperhttp://books.google.com/books?id=Uy7OAAA...gun&f=false Click on p. 73
Bottom line: if there is no choke constriction, or it is less than 2" the barrels are
very likely to have been cut.