I was wondering on how someone would order the proper custom turret. The biggest question is how is some one that lives at 500 ft elevation going to gather the proper data for a turret that will be used at a elevation 7500 ft elivation. Do you have to travel and find a range that is up to 400 miles away and gather data or is thear some other way to do this.My gun will be back from my gunsmith in 6 weeks and I will be working up loads. the gun is a 28 nosler with a 26 kreiger barrel hopeing to be shooting 180 bergers at or close to 3100 fps.will be using this gun for elk hunting . As of now looking to extend my range from 350 yards to 700 yards. any sugestions would be appreciated.