.22 to the ear in the trap, clean trap n bait it again. U using live traps or foot hold? We used to use a steel 55gal drum, hole cut in top bout the size of a 5gal bucket, sardines in the bottom of of drum, 6-8" tree limb leaned up against the drum to allow the coons to get on top of drum n drain sardine juice up the limb. We dang near caught them all out on nearly 2ac in the winter/fall time back in the late 80s early 90s.
I use a live trap, but that 55 gallon drum truck sounds like it will work like a charm. I know they want corn bad. They chewed the funnel up on my feeder so it would pour it all on the ground. They are 100# in three days!! With a little help from the deer.