About 30 or so years ago when I was transferred from Ohio to Pittsburgh the guy that moved me was from an outfit in Pittsburgh. When he saw my guns he took extra care with them and said would I like to hunt with him. He belonged to a club that he called the thousand yard club. The requirement was your shot had to be at least 1000yds or you paid a penalty. If memory serves he used a 300H&H. It's been a long time ago. He said he used an old military rangefinder on a tripod and set up on a powerline right of way and was usually successful. I never took him up on his offer.