One: Empty 2 liter soda bottle, about 18" line and small stout hook. Thin slice of beef liver for bait--It is really tough and hard to get off. Toss them out at night like you are jug fishing. Next morning check for jugs near the bank. The turtles will try to hid in moss or under bushes.
Two: 223 with hollow points. A bit more power makes all the difference.