Quote: "Power: I fail to understand how 600-700 ft.lbs. in a handgun is overkill when 1100+ ft.lbs. in a rifle (5.56 NATO) and 1500+ ft.lbs. in a shotgun (12 gauge) is considered ideal for personal defense."
It would be a bit foolish to use a rifle for self defense in a civilian situation too, in my opinion. The shooter had better have a big checkbook to pay for all the stuff they make a hole through when they shoot somebody with a rifle in a neighborhood. One of the basic rules of gun safety is - "Know what's behind your target." Whatever happened to that on these forums?
Apparently you're not familiar with the penetration characteristics of the .223 Remington/5.56 NATO cartridge. Both the M193 and M855 loadings display only 4 and 2 centimeters more penetration respectively in gelatin than the 158grn LSWCHP +P .38 Special "FBI Load" due to yawing and fragmentation.
http://www.firearmstactical.com/images/Wound%20Profiles/M193.jpg
http://www.firearmstactical.com/images/Wound%20Profiles/M855.jpg
http://www.firearmstactical.com/images/Wound%20Profiles/38%20Spl%20FBI%20load.jpg
Quote: "In Double Tap's gelatin tests, their 10mm ammo with 165grn and 180grn Speer Gold Dot bullets penetrated .25 and .5" more respectively than .40 S&W loadings with the same bullet."
Then why use 10mm at all if the only justification for the extra flash and recoil is .25" extra penetration?
You must not have noticed the expanded diameters in my link. The 165grn 10mm expanded to 1.02" as opposed to 0.70" with the same weight .40 and the 180grn 10mm expanded to 0.96" as opposed to 0.68" with the 180grn .40.
So why not use 41 mag or 44 mag or 500 S&W for self defense then? What exactly is the ceiling for a reasonable round for civilian use in an urban setting out of a handgun?
The ceiling is the most powerful gun that the individual can handle the recoil of and is small enough to be practical for its intended purpose. A S&W 629 .44 Magnum is my EDC in the winter.