I had some pellets T7 that I left outside with top open while shooting in my rifle. It came a very heavy dew that night saw them the next morning they were discolored half way down the pellet on the top rows that were exposed to the moisture. 2 days later took them to the gun shop he said I shouldn't use them, but offered for me to try them through his chronograph we saw no differents in velocity other than the normal 25 fps or so that you normally see between shots, I continued to use the box and finished it off last season it was 3 yrs old at that time.