I'm sure that you know this already, but military ammo also comes packed in cardboard boxes and bandoliers. The only time I can see there being an issue is when you are using cans that won't seal correctly, or moisture was introduced.

Quote Originally Posted by RearwardAssist View Post
Also be careful with the ammo inside of factory boxes the cardboard will soak up and hold moisture can cause corrosion. A guy on my local board did a write up on his factory boxed ammo being put in a can with dessicant and showed the corrosion when it went bad. I used to line the walls and top and bottom of mine with card board and took it out after reading that write up and seeing the pictures.