Thread: Old reloading data

Hi all, I have a few boxes of reloads that I loaded back in the 80s and 90s, last box dated in 2000 that were loaded for my 1900 m96 Swedish Mauser. The load is 41 grains 2208 120 Sierra or Speer projectile, cci primer in norma cases. This load was supposed to be a mild load back then,but now modern data list 39 grains as maximum. Has the burning rate of adi powders changed since then or have they reduced the load data to accommodate these aging firearms? I fired off a few rounds a few months ago without any pressure signs, however we fired off some previously on a 40 degree day and the bolt was tight to open on 2 rounds. The ammo was sitting in the sun so would have been very hot. Interested to hear your thoughts regards steve