I went to JMB calcs and set the numbers for my load at 900ft. This particular load runs 1000ft lbs to 700 yards. Same load at 11,000 ft altitude keeps 1000 ft lbs out to 1000 yards. Is this correct? I kept the standard atmospheric conditions at JMB's default setting, and checked on the box that states "standard atmosphere at altitude". Did I do this correctly?