They're pretty damn elusive. I think once they figure out you're there, they'll back off unless you put goats or calves out there.
When I hunted in Coleman Co, they were around and we were told to watch out for them, but never actually saw one. Felt pretty comfortable toting a 38 around when we were working on stuff. A few ranches down the road, the owners wife was pregnant and couldn't sleep one night, so she decided to go on a midnight stroll in the moonlight around their pond. She stumbled on some big cat. She said it was big like a mountain lion, but spotted, so there was some speculation it was like an ocelot or one of the rarer mexican cats.
Dad shot a bobcat out there with his old 30-30. He hit further back and gut shot it and it crawled off into some scrub and I had to go find it. Talk about pissed. Those growls made the hair on the back of my neck stand up. I gave him a couple in the head with a 22, then waited to make sure.