why does powder sometimes deteriorate in cans, but powder in cartridges doesn't seem to?,
I read things like this repeatedly on gun forums. Which leaves me to wonder; a) why does powder sometimes deteriorate in cans, but powder in cartridges doesn't seem to?, and b) even if it shoots, does anyone have any data to suggest the velocity or pressures are similar in 40 year old ammo to what it was when it was new?
i recently destroyed hundreds of rounds of .30 caliber and .30 Army (.30-40) ammunition with deteriorated powder. It was all made prior to 1930.