I have ben doing load development all summer long. I finally found a load that shoots great in my rifle. I cronographed my load at 3278 fps at 900 feet of elevation and 60 degreese outside temp. When I go hunting next month base camp will be at 9000feet and hunting in elevations up to 14000 feet. When i imput the information in my sierra program will my load speed stay the same at this elevation. The temp will be colder where im hunting probally around 30 degrees. Im shooting H50bmg powder.