YEEPS! That look about as agonizing as it can get, as well as embarrassing too. Now imagine if that shell was loaded with rock salt... Or parasitic worm larvae...
The question is not "what can you load in a shotgun shell?", but "WHAT CAN'T YOU LOAD IN A SHOTGUN SHELL?" There had been the folktale of a Union gunboat towards the end of the Civil War which had lost course during a bad storm and ended up deep inside hostile Indian territory. As the enemy warriors were attempting to board the steamer the crew did not expect hostilities at the start of their journey and the ship's deck guns were not loaded, with only one charge of powder for each next to them, and the shells were locked away in the magazine deep within the ironclad's bowels. The captain, using his quickest wits, ordered the crew to bring balls of cheese from the mess section as it was much closer, pack them above the powder and had the first couple of deck batteries discharged into the mass of attacking hostiles. The barrage of cheese at roughly 2000 FPS out of the 12 pounders eliminated the first wave of the attackers and the rest beat feet out of there fast once they saw what the smoke-spewing ironclad was capable of.