Originally Posted by
C-grunt
I believe Dr Roberts has stated in his studies that the 40 performs better through windshields and auto body than 9mm. From my experience investigating shootings Id say he is right. The 40 does seem to perform better in the shootings involving auto barriers that Ive seen. The 40s seemed to retain their terminal performance better.
However my experiences are limited and in no way scientific. Either way the 9mm still worked through the auto windshields and body work and I still choose 9mm for the other benefits.
I would agree (not saying that should carry much weight) If I remember correctly it was theorized due to the construction of the different projectiles - the .40 bites into the glass with less deflection.
I've heard a couple of gems in training that have stuck with through the years, one of which was that when shooting through barriers you are actually shooting two rounds, the one that impacts the barrier and the one that leaves the barrier.
Laminated windshield glass, aside from it's angle, is kind of rough on rounds, jacket separations aren't uncommon. So it makes sense that you are going to have heavier hunks of .40 left comparative to 9mm.
I'm of the mindset that you 'make a port with the first couple rounds when shooting out and aim a little high when shooting in' regardless of what round you are shooting.
Going out it isn't like you are going to reliably put rounds on a target 20 yards down the road - unless you've created a port; going in, it isn't like the guy is 5 yards from the windshield. Also, from outside the vehicle, you can alter the angle with which the round strikes the windshield.
Last edited by 26 Inf; 07-12-20 at 18:18.
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