I was told in my class to get my permit that the wwb from wal mart is bad ammo. we were shown pictures from guns that blew up because of it. i know that is the extreme, but from what our insructor said they have been taking out notices that say dont use that ammo in your gun. the shippers have been taking them out of the gun box. and it will void your warranty if you use it. i am trying to find out more about it becuase i bought 300 of hollow points and really dont want to throw them out.