I've been carrying 180-grain rounds for about 3 years, Federal HSTs and Speer Gold Dots. Both outstanding designs.
Recently, having read some issues about bullet setback possibly creating dangerous pressure levels in .40 S&W guns, I have decided that when I swap I'll be going with 165-grainers.
While I think Winchester Ranger T-Series, Remington Golden Saber, Federal HST, and Speer Gold Dot are all excellent rounds, I prefer HST and Gold Dot because I have found ATK's quality control (ATK makes both of these) superior to other brands.
While Hornady's Critical Duty is a very cool looking round, I've seen and heard of more issues with Hornady pistol ammo than any of the above mentioned rounds - squib rounds, loose primers, etc.
The 165 and 180 weights in .40 S&W have well-documented histories of being very effective, and the 155 is no slouch either.
The Gen 4 Glock 23 is an excellent platform for the .40 S&W, and arguably the best 4th-gen Glock. Good choice.
Beretta PX4 .40 S&W - Beretta 92FS 9x19 Para - Rock Island Armory GI 1911 .45 ACP - Colt 1968 Detective Special .38 Spc. - Ruger LCP .380 ACP - Daniel Defense M4V1 Carbine 5.56x45 - Alpine Industries M1 Carbine .30 - Steyr-Mannlicher M1895 8x56 - Ruger 10/22 .22LR - Remington 870 Express Tactical 12GA - 1943 Izhevsk Mosin-Nagant M91/30 7.62x54R
Last edited by LockedBreech; December 7, 2012 at 10:48 PM.