I wanted to split off a discussion fromthe .40 FBI thread to a question I had revisiting the information based around the "FBI shootout"
The basic questions is: What about ammunition, specifically in 9mm has improved that gives it the required penetration of 12" at a consistent rate.
The reason I ask is based on 2 things. 1st page 5 of this report shows only a 67% penetration rate of 9mm (and 38 +p):
http://www.firearmstactical.com/pdf/fbi_10mm_notes.pdf
Of course that is now 20+ years ago. We have in our stickies data showing 12" penetration from several 9 mm loads and a note that bullet design has improved in the intervening years. (Not to mention resources around the web that demonstrate the same data for current loads).
I was just curious as to the specifics of What in particular about design has improved the penetration rate of the smaller caliber rounds?
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