A buddy and me used to do ballistic test on cull watermelons. He had an old sawed off single 12 we would use. At close range a round loaded with copper wire ( without insulation ) would do the most internal damage. It would enter and start deflecting in every direction. For just plain destruction and gaping wounds bb's, glass, rocks, and other larger projectiles. Have always been curious about mercury in bullets, as in jaws.
It works like a champ (mercury that is), a lil drop and some bee's wax on the end................like a champ!