Don't use bio BB. Unless you buy madbull or excel bio BB, they are not really bio. I heard they degrade only 10 weeks faster compared to non-bio BB. Plus, they can be dangerous because they may explode on impact. Finally, they may jam and breaks your gun. In my Crossman Springer, there is white powder everywhere since I shooted the Artic White bio BB from walmart.
Last edited by DrZooker; March 20th, 2009 at 11:30..