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OK...
I there was an FBI shootout in the 80's in florida thats when the 40 came around... the rounds the FBI was using at the time were 9mm if I remember what they told us.. 2 agents were killed and 5 wounded
now
with any gunshot wound you have alot of factors that create the "stopping power"
Penetration
Expansion
mass retention
velocity
chamber pressure
then you got
strike velocity
strike energy
energy deposit
efficecency
crush cavity
stretch cavity
and a few more factors but we will focus on those for now....
the FBI found that around 12 inches was the min for penetration to be effictive
so basicly
what it boils down to is the .40 although slower ranging from 900-1200 fps had more one shot stop power because as you know a through and through is the easiest survived gunshot....
the biggest crush cavity from a 9mm is around 3.9 or so while the 40 produces a 6-6.9 crush cavity
what does that mean?
when the bullet hits there is trama to the surrounding tissue and inside the body that is not seen... bigger crush cavity more one shot stop....
now im not saying the 9 won't kill a human but you need to be carefull where you place that shot... head shot a fucking 22 will do the trick....
but center mass is what im talking here
the 9mm has an expansion to .55 the 40 to .72 on some +p loads which means begger fragment in the body to do the damage
the best one shot stop 9mm is about 84% from what I am reading now while 40cal is 97% on the 155 grain hydrashok I like a lighter bullet I do not shoot a 180 but I like a +p load myself
the 40 is a nice blend between the 9 mm and the 45
for a great one shot stop bullet
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