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So why are nearly all 40 S&W bullets truncated cones rather than a more rounded nose like a 9mm or 45ACP. It this to mazimize bullet weight and case volume, improve feeding, improve ballistics or just to look cool. Just curious.

mcb
 

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It is to give the .40 a larger frontal area. Big and flat equals more tissue damage than a round nose bullet.

Also, the .40 round was designed for easy feeding to tight .40 chambers. The 40 S&W runs upwards of 40K CPU's, high internal pressures. the TC bullet shape facilitates easier feeding into the chambers. Glock chose to ignore this and had unsupported chambers even with the high pressures of the 40.

The .45 1911 is also unsupported buy operates at much lower pressure.

The .40 evolved from the 10mm round. The FBI found it too hard to manage due to recoil and whala, the .40 which is about an 1/8" shorter.
 
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