that is why after I get my 100 yard zero locked in and then true my kestrel to the round at 1200 I shot rock, ledges with cracks ect at all different ranges and times of the year up here from spring to fall and in to winter so temp change rests for gun change altitude and temp along with different winds just to be ready for taking my winter meats when the shot comesSo just out of curiosity what type of range facility and benches are they using at elk camp ? Are the targets on the same plane as they were where you sighted in at not up or down angled from at the home range . Is it close to the base of a cliff , or maybe in a canyon or large draw ? We have a lot of changing air currents where I live when you are at the base of a cliff depending on the direction of the wind hitting the back side of the cliff you can have a down draft or if it's blowing toward the cliff face on your side you can have an updraft . Down in Colorado at the Bolder air port they have what are called rotators that are similar to a tornado laying on it's side but you can't see them with your eyes as they don't pick up any ground litter and before they learned what was happening there were several small planes that just all of a sudden nose dived dropping several hundred feet in seconds . Perhaps something of this nature is happening so that there is a hard downward wind between the shooter and the target . Just some thoughts I had from some of the things I've seen in the mountains that people from other places may not have seen yet .
Dry air is more dense than humid air. Of the inputs to a ballistic calculator temperature, air pressure (true station pressure not the more common cited corrected pressure ) and humidity, humidity has the least impact.Generally speaking the higher in elevation the flatter the trajectory. However if you sighted in at a dryer climate but are hunting in high humidity that could offset that elevation effect with a slower bullet flying through denser air. Temperature could be an additional factor. Your MV at 80 degrees will be faster than that same powder charge at 30 degrees. Ive read some guys keep their ammunition in a protected pocket from the cold and load only when ready to shoot so the round isnt effected by heat OR COLD temperatyres.