Smashing Bottle

I had a smashing time this morning with the air cannon and a couple of left over beer bottles. The air cannon was pumped up to about 80 psi and an 8mm ball bearing loaded and fired. On this shot the ball bearing has actually bounced back off of the bottle. I think I hit the bottle on the point where the body slims down to the neck that is possibly a bit stronger than the main body of the bottle, hence the ball bearing didn't pass through.