From "Ruger and His Guns" by R. L. Wilson, Simon and Schuster, 1996; page 126; interview with engineer Harry Sefried:
"The (ROA) was of incredible strength, as Bill always insisted. I decided the logical way to test these was to do so with Bullseye smokeless powder- definitely not recommended to the public! I'd stoke the cylinders up and pop the cap. You can't, however, ignite Bullseye with the spark from a percussion cap going through a tiny hole in a blackpowder cylinder nipple. We opened these up, and boy, were we getting ignition! We found we couldn't get enough Bullseye in to blow the cylinder. Even if not filled up, we could not blow it with Bullseye powder! (Again, not to be tried at home.)"
Someone else will have to speculate what happened with the Super Blackhawk you mention.