I got to agree with Sarge. Bad shot is the problem, not a super tough skull.
I've seen the same thing with 22LR Hyper-velocity bullets on woodchuck skulls. 99 times out of 100, brain splatter, that other 1 time, ricochet. It's just the coming together of the variables.
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Nobody plans to screw up their lives...
...they just don't plan not to.
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