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Old 12-17-2012, 06:38   #682
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Join Date: Dec 2005
Location: London
Posts: 6,086
Originally Posted by scottyd2506 View Post
maybe so but that 135 in a 40 cal is has a sectional density of like 1.21. it is going to slow down like a parachute, once it hits the fat layers and muscle the bullet will likely be sub sonic through the vital organs. esp a larger built BG.

going super sonic through the vital organs like the 357 does seems to be key in the police saying of "lightning bolt effect" I'm sure it would kill as good or better ,but we want the extra shock to STOP the attacker

The 357 sig can launch a bullet with a sectional density of 1.41 at 1500 fps from a 4 inch bbl. with that kind of sectional density the bullet does not slow down much as it penetrates probably going 1200 fps through vital organs.

The 9mm 45 and 40 can NOT do this. I'm sure a skinny bad guy it might, but some of those 260-350 lb attackers have extra layers to go through and the Sig seems to be able to break the sound barrier inside of the BG vitals.
I don't deny the existence of what you call a lghtning bolt effect, but, whatever causes it, it is not a supersnic phenomenon. The speed of sound varies with the density of the medium and, although the density of the body varies, its speed of sound is generally well above the speed of the fastest conventional rife bullets.

What is most probably causing the effect is a blood pumping phenomenon to which the so called vital organs are not significant, but which depends on the speed with which the bullet releases its kinetic energy. Thus the 135gn .40 cal is an excellent candidate, but, as you say, it might not work on someone with a thick enough layer of fat.

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