Many police of the 20th Century used to pack revolvers chambered for the .38 Special cartridge. The .38 Special designation was a holdover from previous caliber designations (38 Short Colt and 38 Long Colt) as the diameter of .38 is actually the diameter of the case rather than the bullet. The bullet being .357 in diameter. Which means it should have been called the .357 in the first place but conventional naming customs caused it to be called the .38 Special.
As certain police departments began encountering dangerous criminals carrying superior fire power, the .38 Special began to lose favor and was looked upon as a weak round. John Browning’s .45 caliber Colt 1911 had been in production for many years and had an excellent track record but, for the most part, the civilian police agencies opted instead for the .357 Magnum revolver to replace their .38 Specials.
It soon became clear the extra power of the .357 was having a negative effect on the marksmanship scores of police since rarely do police spend much time honing their shooting skills. The .357 Magnum recoil paired with the heavier frame necessary for the cartridge was just a bit too much for most officers.
Enter the 9MM. As police agencies began transitioning to semi auto side arms the most ubiquitous caliber became the 9MM Parabellum or 9MM Luger which had been introduced back in 1902. The 9MM bullet diameter just happens to be .356 and also uses a case approximately .38 of an inch in outside diameter (actually tapering from .391 to .381). But two years earlier the 38 Super Auto was introduced which used the same .356 diameter bullet but in a case about 25% longer then the Luger.
In the mix is also the .380 Auto, a short version of the 9MM Luger called the 9MM Kurtz but it has only a .374 case diameter. This is especially suited to concealment although it lacks the “punch” of its larger siblings.
With calibers ranging from the .22 to the .45 and even larger, why does the .38 or rather the .356/.357 diameter bullet continue to see so much success? What makes the .357 such a magical number?
I argue it has to do with a ratio of cost in weight and efficiency of velocity to powder charge to the end effect of terminal ballistics which makes the “.38” caliber such a persistent winner for over a century. While the .45 packs a heck of a wallop, it tasks the operator with a heavy recoil as well as a disadvantage in number of rounds per pound of weight carried. Smaller calibers, while maintaining some impressive numbers in velocity and carrying capacity, present a smaller cross section on target and therefore lose the energy transferring edge of velocity over their larger cousins.
Just a few loads for comparison…
38 Special 110 Grain XTP max load 1308 FPS
9 MM 115 Grain XTP max load 1305 FPS
357 Magnum 158 Grain XTP max load 1686 FPS
I don’t know what the future holds but I am willing to bet the thirty something caliber will be around and viable for a long time and that mid thirty caliber .356/.357 will be there also.
What do you think?