A former employee, as a child, was hunting rabbits with a single shot shotgun. He was missing more than he hit so he decided that the power level of the ammunition was at fault. Needed more powder. He opened a shot shell, dumped the shot and wad. He retained the powder and the only source of additional powder was a box of .22 LR. Since it was a 20 gauge, he opened and dumped 20 .22 LR powder charges on top of the shotgun powder already in the shell. He replaced the wad and shot and folded the mouth of the shell as best as he could by hand.
Off to the hunt.
He spotted a cottontail hiding in a clump of grass on the far side of the creek at a distance of about 15 yards. He took careful aim and fired. When the smoke cleared he was holding the butt stock and part of the receiver of the shotgun. The barrel and fore stock were gone. He was unhurt and much wiser.
They never found any remnant of the shotgun and the rabbit either vaporized or ran while the smoke was clearing.