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Let me be specific in expanding my questions for you or anyone else. One key to accuracy at long range is pressure of the load your using and how that load will be effected by temp humidity over all conditions your shooting in at the time. Agree or not the only way we as handloaders can get a idea of pressure of our handloads is over a chronography. Taking head and case expansion numbers from fireformed cases give us mixed results. chrono handloads vs factory loads is the best we can do with out lab conditions and saammi pressure loads agree or not. Based on this is it not best to get baseline for our long range shooting based on chrono numbers vs factory to get pressure, velocity. then work on just a 100 yard target in all shooting conditions, data factored in at longer range and adjustments made off that data . As temp changes should we not have a solid 100 yard baseline to work adjustments off of for longer range. The key as I see it the work done on data for our specific load at the 100 yard mark this is the baseline  for all adjustments for longer range. What ever load specific powder primer bullet OAL we use at the 100 yard mark. The data over the scale of temp humidity changes air density wind deflection vertical deflection at the 100 yard mark will effect adjustments long range. My point is this if one gets all data for the 100 yard mark for a given load with knowen pressure temp humidity deflection angles as baseline then all adjustments after the 100 yard mark should be based on solid data. Should baseline for a specific load under all factors be based on the 100 yard mark and adjustments made off that data. I will be the first to say I am not the best at puting words and thoughts into a clear topic. I would like others to give opinion to this theory. thanks Michael Lane