Might also Flitz the bullets beforehand to try for a cleaner end result on at least one side. Anybody recognize the bullets? Might save on research to know what expands best in water beforehand. (I know hollow points, LOL, wanted to know manufacturer.)
(fill a trash can up with water, shoot straight down, dry off afterwards....cuz it splashes like hell)
I had a friend who became the Sheriff of Bosque county. He shot the old black talons into a 55gallon drum filled with water. Just to see if they would "claw out". Which they would. Bullets only go about a foot down. Mythbusters proved that. 50BMG went like 3' down.