If you could tell me the name of your BB gun and the FPS on it would help I have a Winchester pellet rifle that shoots roughly 1250 FPS I cant use steel BBs in it but I use pointed pellets because the penetration would be bad on a head shot with a wadcutter. So if I had to do It I would pump it to the max use a BB because it will go through the skull better than a pellet and shoot it point blank in the eye or between the eyes. but my advice is just not to do it. BUT if you dont have anything bigger I can help you out also just e-mail me: [email protected] I have done LOTS of researchon "primitve" weapons.