Watermelons, pumkins, canteloupe, etc. For really good results you need to use hollow points. A buddy and I once took a bunch of old canned goods out and shot them. That was pretty fun with hollow points. A 125gr hp from a .357sig will do wonders to a can of pumpkin pie filling.
Most of the time I use plastic bottles and cardboard boxes with targets drawn on them.
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If anybody needs me, I'll be on the river.