I was web searching You-Tube last week and saw a video that portrayed a guy who had an 1887 Winchester lever shotgun that had been converted to shoot 12 gage brass hulls that were necked down to .70 caliber and a 700 grain lead slug on top of 120 grains of 1Fg Black Powder. He also had the gun barreled to boot. It showed him firing this gun and the reaction he had gives the impression that it kicks like a mule.