I'll pass on some information a friend of mine received from Montana Game & Fish personnel last winter when there were two cougars around his neighborhood. One was a male and one was a female. They said you can tell the size of a cat by the number of inches between steps. The one around my friend's ranch had 30" spacing between steps and they told him that was a pretty large cat. I didn't hear any weight guesstimates, sorry.
I did go out to his ranch the week after these two cougars killed three sheep and I did see their tracks about 1/2 mile south of my friend's cattle feed lot!! Kind of makes the hair stand up on the back of my neck knowing I might well be the hunted instead of the hunter!!!