Here is a link to the data you requested.
http://glocktalk.com/showthread.php?s=&threadid=336612
I will cut and paste the info about 40 and 10.
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DoubleTap .40 S&W Penetration / expansion
165gr Gold Dot JHP @ 1200fps - 14.0" / .70"
180gr Gold Dot JHP @ 1100fps - 14.75" / .68"
DoubleTap .357 Sig
125gr Gold Dot JHP @ 1450fps - 14.5" / .66"
DoubleTap 10mm
135gr JHP @ 1600fps - 11.0" / .70" frag nasty
155gr Gold Dot JHP @ 1475fps - 13.5" / .88"
165gr Gold Dot JHP @ 1400fps - 14.25" / 1.02"
165gr Golden Saber JHP @ 1425fps - 14.75" / .82"
180gr Golden Saber JHP @ 1330fps - 16.0" / .85"
180gr Gold Dot JHP @ 1300fps - 15.25" / .96"
200gr XTP @ 1250fps - 19.5" / .72"
230gr Equalizer @ 1040fps - 11.0" and 17.0" / .62" and .40"
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So let me ask you a question. Would you rather 14.25" of pentetration and a 1.02" diameter hole or a 14.0" penetration and a .70" inch diameter wound on a BG? Also, do a search on a topic I posted that compared energy dump.
What "energy" dump is is a seat belt. IF you crash a car into a brick wall without a seat belt, and are going 60mph the car stops and your body is going 60mph. You decelerate rapidly once you contact a hard surface. Typically, this causes lots of trama. IF you are wearing a seat belt, you decelerate with the car cause less trama. Would you rather jump off a 5 story builing onto concrete or off of a 7 story building with 2 stories worth of very soft foam? Would you rather hit a brick wall in a car going 100mph or 150mph?
WHy do I say this? When you take something and decelerate it fast, it causes trama to a body.
When you figure that all deleceleration of the bullet occurs in the geletine, it is causing damage. Take a bullet weighing 165gr and decelerate from 1200ft/sec to zero in 14 inches. That dumps 2011Newtons of force into the body (remeber force = mass*acceleration, deceleration is simply negative acceleration). Take that same 165gr bullet at 1400ft/sec and decelerate it to 0 in 14.25 inches and you have dumped 2689 Newtons into the body.
Geletin is a visocelastic material. It requires force to rupture along with a unstustainable strain rate. The faster a bullet is moving the greater the strain rate is on the material.
I know that you probably don't really see the need for the extra damage, or maybe you do. However, I would ask, would you rather have the extra power or not if and/or when you actuallyneeded it?
Also, keep in mind that the FBI dropped the 10mm for other reasons. They had determined that a 180gr bullet moving at 990ft/sec is what they were after BEFORE they began testing. This was based upon performance data of a 185gr 45ACP round that had worked well. Therefore, the 10mm was downloaded for the FBI based upon thier wishes. In fact, S&W and Winchester started developing a load (40SW) based upon the 180/990 requirements that they could get to market fast in by converting a 9mm pistol. What is ironic, is that Glock actually beat SW to market with a pistol that shot the S&W caliber. Also, a common misconception is that the Glock 20 was before the Glock 22. The Glock 22 was actually on the market first. The G20 was being designed first, but was put on hold so that the G22 could make it to market before S&W was to the market.
Not always is teh choice of LEO mean that it is the best gun.
I would bet that there are soldiers who don't think that a M9 is better than a 1911 and that an M16 is better than an M14. Some would argue that the M16 is better than the M14. Same with M9 better than 1911. But decisions are made like that, like them or not, for military and LEO all the time and many times aren;t just based upon performance.
-Dana