Essentially it would need to pass through two bones though. Passing through the one side of the skull would have greatly reduced it's power. It's highly doubtful it would have had enough power to exit the other side (or second bone).
One more From Steve Moore RSBM (He was a SNIPER lol!) I snipped it, but the whole issue about the bullet can be found here:
http://gmancasefile.com/moore-to-th...erer-an-fbi-agents-take-episode-6-part-2-of-3
The Magic Bullet:
Lrange 22 on the right...
"The .22LR, therefore does not, except in the most unusual circumstances, exit the skull after it is fired into the head. It lacks the mass or velocity to punch through the second wall of bone. It is my opinion that if Teresa Halbach was killed with a .22LR bullet to the head -- even at point-blank range -- the bullet never exited her skull. So why, then, would it be on Avery’s garage floor? And why, then, does it even still exist? It should have been destroyed in the fire.
For a fire to have been hot enough to destroy Teresa's body the way it did, the temperature of the fire would have been had to of been over 1000°, probably closer to 1500°. Lead, which makes up the vast majority of .22LR bullets, melts at 621°. You see what I'm getting at here? If it was a .22, the bullet stayed in the skull. If the body was burned, the bullet melted. Period.
Could she have been killed by a larger caliber bullet that actually excited the skull? Certainly. But the bullet the prosecution claims bears Halbach's DNA is a .22, which poses a real problem for me.
What, you ask, if for some odd reason the .22 exited her skull? If the bullet which killed Teresa Halbach (if indeed a bullet ended her life), exited her skull, it would do so at a relatively high rate of speed. It would not have come out of her head and fallen onto the ground a few inches from her. It would've continued until it impacted something solid and then fell or ricocheted. When bullets hit solid objects, they either fragment or carry the marks of the impact with them. Therefore, examination of this bullet is crucial. It's not just whether Teresa's DNA is on it; the actual physical characteristics of the recovered bullet might provide valuable information.
I tried to imagine a scenario where Teresa, in the garage, was killed with a .22 rifle bullet to the head, which then exited her head (highly unlikely) and resulted in the bullet remaining in the garage (in this case, under the compressor.) The problem I continued to run up against is that there is no patent or latent blood in the garage, so I cannot explain how she could have been killed in the garage. If she was not shot in that garage, the killer (or someone else) would have had to have come upon the spent bullet after the murder, kept it, and discarded it on the floor of the Avery garage. Not something Steven Avery was likely to do. Why take the time to burn her body, then drop a bullet with her DNA on it on the floor of your garage? Another thought I had was that she might have been shot somewhere outside the garage when the the garage door happened to be open. Then, against all odds, the bullet ended its flight in Avery's garage. I find those scenario far-fetched.
