I've never has much problems with them when I used them. It was stainless steel barrel, and I was a guy that had to clean every time I used my firearms. Nowadays I've learned that isn't required for typical range guns.Well with what I found last summer?? I would think for those that dont clean and store in a low humidity steel box you could have a problem. I was really surprised when I pulled a handful out of that can and the bullets felt like 220 grit sandpaper. Its been over 20 years since I had loaded them, but I didn't expect that.