I've heard stories of ranchers from So. Brewster and Presidio suspecting lion predation and know 2 people who said they've seen the big cats (yes, seen) in the Big Bend area.
Heard any bear stories, Art? Or better yet, seen any evidence where you are?
As for hitting a rock at 200 yards with the 629, I know the gun is capable of it. I'm still learning to stay on paper at 25 yards. Best distance shooting I've been able to do is put 4 out of 6 at 100 yards into a 1" steel plate about 30" across.