The first 44 magnums came out in 1956, but Colt waited a long time to make theirs. The anaconda came out in 1990, after S&W and Ruger already had the 44 mag market dominated. DW also made 44 mags for a while. Another misstep by Colt on that one.
Smith & Wesson introduced the .357 Magnum cartridge around 1935. Does anybody know when Colt first offered a revolver chambered in .357 Magnum? I think it was their New Service model but I'm interested in what year Colt first made a .357 Magnum revolver. And did they ever chamber their Model 1873 sa revolver in .357 Magnum before the introduction of the Second Generation series in 1956?