Garth, you are absolutely correct. When the 1886 was discontinued in 1935, production of the 71 began, using parts on hand. There is no difference in the steel of a late production '86 and the 71. When the 348WCF was introduced many 1886s were sent back to Winchester to be converted to the new cartridge. The nickle steel guns are very strong, indeed. My 1915 45-70 has had some of Garrett's +P Hammerheads run through it without a hitch. The 33 and 45-90 are capable of strong loads, too. The 33 is a fine cartridge that, in my book, needs no improvement.