RwBeV;
Check out Alliance Rifle Club web site. They have several matches that include long range each year. Alliance is a Very difficult range. I have held as much as 20+ feet of windage at the long range there. The best group I ever shot with my Pedersoli Sharps was at Quigley 3 years ago. Conditions were right and everything came together. By the time I finished the string the spotters were saying "same place again"
Gotta love the old technology.
BTW, the last time I was at the Cody range, there was talk of a 1200 yd range. Don't know if they ever got it built.