Depending on the source you look at, there are big discrepancies in max loads for the 280 Ackley Improved. My rifle is a Smith Corona 1903A3 Springfield action with a 26” Douglas XX barrel. I’m looking for max loads, in my rifle, for Hornady 162gr BTSP. I’ve picked RL19, RL22, and IMR7828. I loaded one each of four different charge weights for each powder, going up in .5gr increments, so I can look for pressure signs. RL19 - 57.5gr, 58.0gr, 58.5gr, and 59.0gr. RL22 - 59.0gr, 59.5gr, 60.0gr, and 60.5gr. IMR7828 - 60.5gr, 61.0gr, 61.5gr, and 62.0gr (compressed). Bullets are seated .005” off of the lands.


JTD