These are amazingly smooth and round BB's. I haven't ever had a problem with them. They are .25 and bio, so they are accurate and are good for the environment.nElite force bb's are the best I have used. They have actually increased my accuracy, and I haven't had a jam!
Nothing that I can think of right now, except if you open the bottle in the rain and water gets inside, the bbs get a little gross after a while and start to degrade. So stay under a roof when you're loading your mags.