Had an interesting experience yesterday. I took my 300 win mag out and shot some rounds across a chrony that had been loaded back in 1989. I was noticing that, over the years, this lot of ammo was starting to show more drop at longer ranges than it did when loaded. Back when loaded, this ammo went through the chrony @ 3175 FPS with a deviation of 14 FPS when loaded with 72 gr. of 4350. Yesterday, the same lot loaded in 1989 went through the chrony @
shot #1 = 2854
shot #2 = 3105
shot #3 = 2890
shot #4 = 2969
Not only was there a 10% drop in speed, but the deviation was all over the place. Ammo was stored in a nice dry place at temps between 60-85 degrees. I guess the only thing I've proved is that everything has a shelf life. Guess I'm going to have to pull this stuff down and work up the loads again with fresh IMR 4350 ??
Chris