In the last decade or so, ammo engineers have produced a superb generation of 9 mm projectiles that offer penetration in the ideal range and that are capable of good performance after common intermediate barriers. In test after test, most officers demonstrate a higher qualification score when shooting 9 mm compared to other common service calibers. Smaller statured officers and those with small hands tend to shoot better with 9 mm. Service pistols tend to be more durable in 9 mm than those in .357 Sig and .40 S&W. In a time of fiscal austerity, 9 mm ammunition is certainly less expensive. For CCW and most urban LE duty, there are a lot of advantages in carrying a 9mm: easy to shoot–especially one handed, relatively inexpensive to practice with, lots of bullets. When I injured my strong hand a few years ago and lost its use for several months, I found out how much more effective I was using a G19 weak handed compared to a 1911. I suspect in the coming months many LE agencies will shift to 9 mm given the benefits noted above.
[i]While I am not a big fan of the .357 Sig, if I was issued one and had lots of free ammunition available, I would have no issues about carrying one on a daily basis.
If I was in a department that issued .40 or was doing a lot of uniformed LE duty around vehicles, I’d be strongly tempted to carry a M&P40–lots of 180 gr JHP’s that do well against intermediate barriers is a good thing.
The nice aspects of .45 ACP are that it makes large holes, can be very accurate, and offers good penetration of some intermediate barriers. Unfortunately, magazine capacity is less than ideal, .45 ACP is more expensive to practice with, and in general is harder to shoot well compared with 9 mm. .45 ACP makes the most sense in states with idiotic 10 rd magazine restrictions, in departments that give you lots of free .45 ACP ammo, or in situations where modern expanding ammunition is restricted due to asinine, illogical regulations.[/i]
If you have the option, carefully assess what your service pistol and handgun caliber needs are, based on potential engagement scenarios, objective measurements of skill including scores and times, and ancillary factors. In closely looking at where I am at today, my bottom line is:
– Despite having shot primarily .45 ACP from 1986 to 2011, I currently shoot 9 mm better than .45 ACP; as a result, I will be phasing out my .45 ACP usage and concentrating on 9 mm.
– I currently shoot an RDS better than iron sights; as a result, all my carry/duty pistols will be equipped with RMR02’s.
– I shoot an M&P9 better than a G17/G19; however I live in CA and have over 100 pre-ban Glock mags, a large supply of Glock accessories and spare parts, and for my current non-uniformed pistol needs find the G19 to be a perfect handgun for daily carry, so I will be focusing on 9 mm Glock use for 2012.
Whatever you choose, make sure you fire at least 500 and preferably 1000 failure free shots through your pistol prior to carrying it. If your pistol cannot fire at least 1000 consecutive shots without a malfunction, something is wrong and it is not suitable for duty/self-defense use.