A couple rifle reloading questions:
1) I have a number of casings that I have purchased over time as factory loads and have saved the casings for reloading my own. None of these have been reloaded so far. Many of these are years old. Can the casing get old over time and thus should not be reloaded or are they OK to use? They look fine other than needing to be tumbled.
2) I used a chromograph the other day for the first time ever. The readings for my 300 wsm ranged from 3055 to 3113. All were carefully loaded the same. Is this a typical range one would see or is this looser than should be expected for consistency? It was 90 degrees F outside so not sure if that could hurt. Assuming all used the same recipe, what causes this variation?