I think you're running into a problem with nomenclature. There's the "New Model" Blackhawk, which is not really all that new but is as opposed to the older 3-screw model. The Vaquero is generally a fixed-site, cowboy-style Blackhawk; and the original Vaquero (introduced maybe 8-10 years ago now) had the large, strong frame similar to that of the "New Model" Blackhawk; and both the Blackhawk and the earlier Vaqueros had plenty of strength to handle strong loads. BUT, since a lot of cowboy competition shooters don't want or need to shoot full-strength high-power loads in their guns ... AND want a gun with a slightly smaller frame than the original Vaquero, like the original Colts and their clones ... Ruger figured it could make a smaller-framed Vaquero to satisfy that need. So the "New Model" Vaquero is smaller-framed than the old model Vaquero, which is similar to the "New Model" Blackhawk ... I think.