Captcurt
Member
Bob Hagel covered this briefly in his book, Game Loads and Practical Ballistics for the American Hunter. He showed several different calibers with 3 or 4 different powders at temps of -20, 0, 70, and 120 degrees. One load that gives me shivers is a 6MM Rem shooting an 85gr bullet using 45 gr of Win 760. The velocity at -20 was 2978 fps. At 120 it topped out at 3228. The velocity spread was 266 fps. Even the difference from 70 degrees to 120 was 168 fps. That is scary.