I forgot to mention that when I was stationed at Whitefish I routinely communicated with Ham Radio operators in Alberta and BC on the 80 meter band.
I usually asked about dangerous animal encounters since the primary violator of human rights to be out in the wilds in northern Montana was the Moose. (Both genders)
I was quite surprised to hear that it was the Mountain Lion. Seems that when snows get deep in the high country they come down and go after dogs, livestock and children!
IMO 12Ga. OO would indeed be a good choice for them.
One of the stories was about a farmer who heard his dog fighting with another behind his house. He grabbed a 2 x 4, and in the dark began whacking the attacking dog and ran it off. Next morning he was surprised to find that the tracks were that of a large Cougar.
When I was stationed in PA a lady was cooking in her farmhouse. She heard her dog (small one) barking and then yelping. She turned to see that a Mountain Lion had come through the screen door and was attacking her dog. She attempted to defend her dog and was attacked herself. Never did hear the outcome. (no 00 Buck available)
Watched the Leopard video clip a few more times and I guess that the double I asked about in the original post was a large caliber rifle.
Oh well, express sights on a short 12 ga. double could be an asset. We found at F.L.E.T.C. that sights do help when utilized with buckshot, especially on shotgun stress courses. Seems the natural inclination of a shooter under stress is to not obtain a good cheek weld when a bead is used with the pattern often going over the top of the target. The open sights on the 870, however, did help with accurate pattern placement.
USBP1969