My favorite caliber in the Blackhawks is the 30 Carbine, I’ve got some 85 grain loads that come out at close to 2000 fps. Factory loads out of one will clean the wax out of your ears and blow a flame about 5ft.
Those .30 Carbine Blackhawks are loud. A local shop has a Hawkeye show up LNIB recently... It was tempting but where the heck do you find .256 Winchester?