I would choose the Winchester 180 grn Partition JHP load, for cougar, black bear, whitetail load. I chronographed these out of a 3" brl. J-frame just shy of 1200 fps. The JHP would open and transfer energy, then the Partition would hold the rest of it together to keep penetrating and make 2 holes!
I would definately go shoot these on paper to see where they hit, even at close range they may hit a lot higher then you'd think. I thought these would recoil a lot in the 3" J-frame, but surprisingly they were easier to shoot then the Federal 125 grn JHP loads! It's probably a load to shoot sparingly and carry a lot!
Carry a good load, make your shots count, and keep firing until the cougar stops moving!! :wink:
Del