Unfettered Might
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Don't get the wrong idea.. The First shot should Go for Center mass (the chest area).. It is much harder to miss for you, and much harder for the BG to move.. You are not a Sniper.. Go for the chest..
I can crack a roughly 12 inch square box at 300 yards with the iron sights on a SKS about 17 out of 20 times.
I can also put every shot out of my Taurus in a 3 inch shot group at 20 feet.
I might not officially be a "sniper", but I have 20/10 vision and a real steady hand.
But I realize that life or death situations create stress, hence the 2 in the chest and one in the head.
2 to stun and maybe stop the threat, the next one to stop the threat.
We are not talking about guarantees, we are talking probabilities. Which is more probable, you get killed by a mugger inside your gated community in the rich neighborhood in which you live, or you get killed while walking through the projects in the middle of the night with $20 haning out of your pockets while wearing Ralph Lauren? Probabilities. Which is more likely to stop someone in their tracks, a hit from a .22 or a hit from a .50? My money is on the .50 every time. I will lose the bet, once in a while, but I will win almost always.
Yes, a hit from a .22 is better than a miss from a .50 (usually, again probabilites), but a hit from a .50 is better than a hit from a .22. As far as head shots go, the head is a MUCH smaller target than center of mass. If you have the skill, more power to you. But you had better hit right around the nose, as a forhead hit has the possibility of bouncing off.
As a generality, bigger bullets stop more. We can have the 9mm vs 45 arguements all day, and all bullets are lethal, but bigger bullets stop faster.
In a SD scenario, I am only interested in guarantees. It's so highly improbable that the BG is going to shoot back after taking one in the head, one can pretty much call it a guarantee.
I wasn't making an argument about caliber, I was stating the facts about marksmanship vs compensating for lack of it with a larger round.