| | The best weapon for self defense is the one with which you are most accurate - all other factors are secondary.
The 9mm cartridge in combination with the simplest possible delivery system (Glock) is far and away superior to the .40 s&w for the typical gun owner (95% of the time) - it's not even close. The typical gun owner will practice with his weapon very rarely (lots in the begining, very little as the years go by). As such, factors such as recoil (percieved or actual) are paramount - all the stopping power in the world is of no use if you cannot hit your target.
Secondly, the so-called superior stopping power of the .40 round is true on average, but absolutely negligible when 9mm + P ammo is being used. In virtually every statistical test shown, a hollow point 9mm round that exceeds 1300 feet per second (as with most +P ammo) in velocity is unmatched by any criteria by any .40 round. In spite of the +P designation, these rounds still have noticeably less recoil than the typical .40 round. In these cases the statistics will show the 9mm round being completely on par with .40 in stopping power - with an even higher kill ratio. Most perps buy the cheapest ammo sold, with a high percentage of ball ammo, in this case the .40 is superior. Gunfight statistics are inaccurate as a whole due to this.
The statistics that bare out the 9mm as superior are those that compare the best 9mm ammo to the best .40 ammo - in these cases the 9mm has the edge the majority of the time. Most police departments have gone away from .40, and are once again recommending 9mm as the round of choice. The reasons: the lower recoil is conducive to smaller officers and lends itself to less hand fatigue during practice and smaller dimensions of the firearm allow for more ergonomic grips for users of all sizes.. These elements result in a higher degree of accuracy and a greater degree of probability that the gun owner will actually practice with his weapon.
The .40 s&w was supposed to be the ultimate 'compromise round', affording less recoil than the stouter .45 acp, but with greater stopping power than the 9-mm. In most respects the round fails to measurably offer a significant advantage over either of these rounds in it's compromise role. There are higher velocity .40 rounds that are made, but they completely defeat the purpose of a 'compromise' round in the first place. Also, the typical .40 firearm does not lend itself to concealed carry as well as 9mm do, this factor alone is huge.
Pound for pound, the 9mm has proven itself to be the best all-around round for typical carry and defense usage. The true newcomer to the scene is the new '357 Sig' round that reaches +p 9mm velocities along with a greater overall stoppin power, thus far however the round has been confined to the role of novelty round. If you tend to be a very large man, with large hands, and that practices often: then a .45 Glock would not be a bad choice. For all others 9mm is the best option for autos.
And for the absolute gun novice that just wants to 'put it away' in the closet for emergency use only, with little to no practice : pass on the autos and buy a revolver - .38 special for most or 357 magnum for larger folks.
George
(Edited by George W. Cordero on 2/08, 3:05pm)
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