I'm with you on that. A guy pulled this trick on my 119 pound wife when we were in college in CO in 1969. He was loading my Ruger .357 when we were shooting .38s, he slipped a .357 mag in the wheel. It damn near broke my fiance's face. I was so pissed, I told him that I'd break his flippin face! Needless to say, he was banned from the range, and I wrote a letter to the NRA...
People have to be ready to shoot high power loads....I have had all my 3 boys from about age 7 shoot full house .44 mag...and .45 colt loaded to Magnum velocities in my stout rugers and as long as you know you have to HOLD ON....its not that bad...the surprise part is what can hurt you.