Get the .357.
Put a lot of thought into which one, what load you are going to carry, and what holster to buy. Game various senarios in your mind....................
I realize that is the purpose of the thread to begin with.
However, look at the vastly different answers you get from people who have shot mountain lions or are close friends with people who shoot mountain lions as opposed to the people speculating about shooting mountain lions.
I'm just saying.
"When they are hunting they don't want to make a big hole in the fur, they want the pelt. They also do eat the meat."
Ding Ding Ding, we have a winner.
FWIW: When I am out bumming around the woods, I carry a S&W Model 29 with a 3" barrel in a Threepersons holster by El Paso Saddelry.
Most of this bumming around is done in areas where there actually are mountain lions.
I have never seen one and am pretty certain I never will. If one stalked me for dinner, I am also pretty certain I would never know it. I would be walking along, see that light at the end of the tunnel............. A mountain lion doesn't hunt like an enraged Cape Buffalo. It uses stealth and is very good at it.
I carry the .44 because I bought it for that purpose and it has a cool holster. I actually bought it to carry deer hunting with the hope that someday I might have the opportunity to put down my rifle and plug one with the pistol. So, I was thinking more along the line of shooting big game animals when I bought it.