I recently discovered that cold temps can make radical differences in MV. Is this specific to power choice? I have not chronoed my current loads in the colder temps sometimes encountered while hunting, and have just read a chrono can be unreliable in colder temperatures. I am trying to establish a load for each of my rifles with specific bullets in an effort to have my Leupold VX3s customized for bullet drop compensation. My calibers range from 243 WIN to 280 REM. I have a history of retinal tears and can't risk magnum recoil and I am trying to avoid the use of a brake. I use a lot of IMR-4350 and RL-19, but have been trying RL-22 with nice increases in MV. I just read RL-22 is temperature sensitive. I hunt long fields with woodlines, the distances for shots are only limited by my ethics and caliber choice, MV helps. Temps range from 0 to 40 degrees F with an average temp of around 17 degrees in season. Are there powders more stable in a wider range of temps that may provide similar types of MV and accuracy? Will appreciate any sound advice.