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9mm, .40, .45

Tue May 02, 2017 3:49 pm

I remember when law enforcement in my area switched over from revolvers to semi auto. Almost everyone went to the 9mm. Then after a lot of years most of them switched to the .40. Now almost all of them have switched back to the 9mm. I traded my .40 for a 9mm ten years ago mostly because I could get back on target a lot faster and score better hits in double taps and quick shooting. I thought I was giving up some ballistic performance by going to the 9mm. Today that may not be the case. Which is better for defense? 9mm .40, .45. The following is from Guns and Ammo. ( In a discussion of this topic based on fact and data, it soon becomes obvious that recent advances in bullet design within the industry have achieved pistol bullet performance that far exceeds anything that would have been expected in the past. In most any mainstream pistol-caliber bullet, a number of designs are available that provide very good performance and reliability in terminal performance. Several designs stand out as being what everyone else is shooting for: If actual terminal performance data, based on controlled ordnance gelatin testing, are compared for 9mm, .40 S&W and .45 ACp, there is very little difference in the actual terminal performance of any of these cartridges. For all practical purposes, the wound cavities are the same. In some loads, the 9mm is superior: In the real world, when it comes to a bullet designer's choices in what can be manipulated in a bullet design, the 9mm has a significant advantage over the larger calibers because of its smaller frontal area and higher velocity for the sectional density. This allows the designer more flexibility in the rate and size to which he can allow the bullet to expand and how much the bullet will ultimately penetrate. Comparing quantifiable wound cavity characteristics - cavity diameter, cavity depth and total penetration - for several of the more recent bullet designs, there is virtually no difference in performance of the 9mm, .40 S&W and .45 ACP. You would have to give a slight edge in total penetration to the 9mm. If you can't get to the vitals in a gun fight, none of the rest matters. The 9mm has a significant advantage over the other two calibers when it comes to reliability of performance with an intervening barrier. There can be very little argument about the 9mm being easier to shoot well than the two bigger calibers for a lot of people. There is also the considerations of a 9mm being a smaller gun, easier to conceal and capable of holding more rounds.) This is from--- Dave Emary, Senior Ballistician, Hornady Manufacturing.

Re: 9mm, .40, .45

Tue May 02, 2017 7:07 pm

Depending on the situation, I may be carrying a 9mm, a 380 ACP, a 45 ACP, or a 38 Super. Each will do the job. I don't have any 40 S&W pistols, and I don't plan to get any.

Re: 9mm, .40, .45

Wed May 03, 2017 9:32 am

Sometimes I like more bullets. Sometimes I like bigger bullets.

Any bullets that I have with me are great.

Re: 9mm, .40, .45

Wed May 03, 2017 4:16 pm

All will make the bad guy stop being bad. 9mm is cheaper ammo which will allow more range time for people to who need to become more proficient with their weapon. Once proficiency is less of an issue, big, slow rounds are nice because they hit hard and don't pass through.

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Re: 9mm, .40, .45

Thu May 04, 2017 10:17 am

*All* pistols suck for stopping a person from doing something. Ballistically, there very little difference between the three rounds mentioned because of the simple fact that none of them can generate enough energy to put down a human being consistently without a hit to the brain or spinal cord. To that end, carry whatever will allow you to put more hits on target, while achieving enough penetration.

Myself, I prefer carrying something has has more opportunities to put rounds on target as quickly and accurately as possible


Re: 9mm, .40, .45

Fri May 05, 2017 12:15 pm

Saw a bumper sticker the other day. It had a picture of a 1911 and the caption, "Short Fat and Slow isn't always a bad thing". :)

Re: 9mm, .40, .45

Wed Aug 02, 2017 9:10 am

SidecarMikee wrote:Saw a bumper sticker the other day. It had a picture of a 1911 and the gynexin caption, "Short Fat and Slow isn't always a bad thing". :)

Most of the time a 9mm.
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