my favorite cat load is heavyshot #2. but any good turkey load will stop them out to 40 yards. bigger shot gets you more range but check your pattern as sometimes you need a wider choke to handle the bigger stuff well.
cats shot personally.. one with 3 in #5 at 10 yards drt of course. second one shot jumping a creek at 45 yards with HS #2 spun like a helicopter and drt.
third one was shot at 10 yards with HS dead coyote. drt
we were a day behind most places too. finally got on jumped up in a perfect swamp. beaver dams and thick brush. reba just flat out smoked that thing for a good hour. probably circled it 10 times in about a 5 acre end of the swamp. it was caring the mail when it came by me. i got a quick shot off but too much brush or too little skill one or the other. then it broke down into a bad loss. she had no idea. she went around reruning a few loops looking for the loss. we dropped a buddies fox hound in there to help her but it took a hslf hour before she found it again and she shoved it out of the swamp and into some rip rap rock around a big culvert pipe. it was a great chase up until the break down. funny how fast things can change.