I have dont it in 357 magnum with Missouri Bulletes 18bhn 158gr LSWC. I have also acheived this with Missouri Bullets 255gr LSWC in 45 colt. Powders used were h110 and 2400. Its good to note that the 357 load was shot from a rifle and the 45colt load is well above standard pressure for the 45 colt cartridge. It was shot from a 7.5" Blackhawk.
Thanks, that helps. As for the shootin irons mine will go through, they are a couple of 6" barreled SS GP-100's and everything else are 7 1/2" SS Redhawks, 41,44mags, & 45C.