'Don't know specifically what metrics or criteria you considered, but I do know that RMEF has been instrumental in enhancing and acquiring large pieces of public land elk and other wildlife habitat in Montana and elsewhere. Examples are readily found, but most significant have been in the Paradise Valley near Gardiner, in the Madison Range up Taylors Fork and elsewhere, in the Pintlars west of Anaconda, and many other locales. RMEF's role in acquiring many lands has prevented certain adverse impacts from private development. The history is there if you care to "dig" deeply into it.
"Influenced self opinion", although a vague and hopefully not derogatory comment about me, may be accurate as I have been a member of RMEF since the 1980's, close to the inception of that organization. I volunteered and served on the RMEF Gallatin Chapter for many years and served as chair for several years. As unpaid volunteers we raised literally millions of dollars for the projects aforementioned, as well as many others. I am surprised that RMEF did not make your top 5, but I guess it does depend on what you were seeking since you chose the criteria. Regardless of your deep dig and your personal opinion of the value of RMEF, I firmly stand behind the opinion previously expressed on this thread, "IMO RMEF is the best bang for your donated buck when it comes to enhancing and acquiring habitat for elk and other wildlife."
Those RMEF volunteers and I have earned the right to be proud of RMEF and to express an opinion based on decades of successful efforts ... not merely one "influenced self opinion" deep dig.