... Just to add ... in 1956, Ruger called their first large frame flattop ... a Blackhawk. The .357 BH was introduced the previous year on the medium frame. In 1959 they introduced the Super Blackhawk to the world with the protective ears for the rear sight and the dragoon style grip.... I think it was 1962 or so they dropped the .44Mag BH. In around 1973 the .357 was also put on the large frame. The New Model as it is commonly called with the silly transfer bar and all. Until recently the .357, .44Mag, .30 Carbine, and .45 Colt were all on the same frame. Now we have the medium frame back with the New Vaquero, .44Spec and .45 Colt flattops. Now if they'd just put the .357 back on the medium frame where it belongs!
Through all the years the frame has been the same for .44Mag -- the large frame. SBH no different from BH size wise or strength wise.