I'm not sure why you'd want to ask a question about the Super Blawkhawk in the Black Powder section, Mark_Mark. Are you thinking of running black powder in one?
At any rate, I don't have a Super Blackhawk right now, but I used to, and never had a single problem with it. I ran everything from light, 44 Special loads, to HOLY COW!!! What in the heck was THAT??? 300gr 44 Magnum loads through it. I never did get around to running any black powder loads through my Super Blackhawk, but I'm sure it would have done okay with them.
Besides
my having a 7.5" Super Blackhawk, my wife had two of the 10.5" (Super "Silhouette") versions. Back in the '80s, my wife shot AAA "Production Revolver" class in the IHMSA with her two 10.5" Super Blackhawks, was one of the top competitors in the state, and has a shelf lined with trophies in the basement and arthritis in her right thumb joint to prove it.
My wife still has one of her Super Blackhawks - she sent it back to Ruger and had a more "practical" 6" barrel installed on it. It's just a "keepsake" of sorts though - much preferring her Ruger Bearcat .22LR for plinking and shooting ground squirrels, my wife hasn't shot her Super Blackhawk .44 Mag in years.