Blackhawks are still fine for hot loads.
The new model Vaquero now has a smaller (weaker) more traditional frame than the old super blackhawk size frame. They did this to make the guns more authentic to the era of the old west for the cowboy action competition. I beleive that the new Vaqueros are not chambered in .44 mag. If you have a vaquero in .44 mag, then you have an old model and are ok.
The Blackhawks and Super Blackhawks are unchanged and are still tough as nails.