.40 S&W Carbine?

Here is some chrono data I got a few years ago with my KelTec Sub2k and CZ-40B. The KT has a 16" barrel and the CZ has a 4.3" barrel.

Doubletap 155gr Gold Dot = 1247fps from the CZ and 1564fps from the Keltec
Doubletap 180gr Gold Dot = 1124fps from the CZ and 1400fps from the Keltac
Magtech 155gr JHP = 1136fps from the CZ and 1401fps from the Keltec
Masttercast 180gr Cast FP = 939fps in the CZ and 1137fps in the Keltec
 
The FBI got rid of their 5.56 mm carbines (M4) and went to a .40S&W carbine (M4). Believe it or not the 40S&W does better then a .223/5.56 for barrier penetration at typical engagement ranges, (note that the average police sniper shot is 70 yards.)
 
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