Couple of machinists at a large company I worked at (they were also gunsmiths) made custom slingshots and with ball bearings, were deadly with them. Punching through 3/4 inch plywood was nothing for 1/4 inch BB.
Better than nothing.
"Peace is that brief, glorious moment in history when everybody stands around reloading". Anonymous
Earp: Not everyone who knows you hates you.
DOC: I know it ain't always easy bein' my friend....but I'll BE THERE when you need me.