I just checked my powder storage cabinet and found a can of IMR #4064 that had rusted thru-- The wierd part is that it evidently rusted from the inside! It wasn't just a "pin hole"-- the whole can separated at the level of the powder inside. I don't remember when I bought it but it was several years ago. (Lot #TE 5 2201) possibly back in the '60s. The question is has this ever happened to anyone else here? I checked the rest of my "stock" and everything seems to be OK. Any info/insight will be appreciated. TIA, Stan