@thewheels
.308 Win
How did I miss this? Birdshot will just piss your attacker off. The pellets will not penetrate deep enough to strike vitals, bleeding will not be severe enough to cause rapid incapacitation from the drop on blood pressure. I won't argue this fact though, the evidence is out there if one cares to look. If not, no skin off my nose.
I hear rock salt and rice krispies work even better.