Dust and smell.
Only ever found bad powder once, and it wasn't real old.
Funny thing about old powder,
Everyone worries if it's bad. "Will it blow up my gun?)
But they will shoot ancient loaded rounds?
I have had bad Remington 243 ammo from the 80s.
Misfires, on inspection, their was corrosion at the bullet and primer edges.
I bought it new, stored in the living area of my homes the whole time.
Well whippersnapper... 80s ain't old. I have shot and know a friend that still has some ww1 45 ammo. Worst part is now and then one won't go bang...
