Whoa, wait a minute. This thread is about the .357 125 grain Federal, not the .357 125 grain Gold Dot. More to the point which one is the vaunted 'King of the Street' that some like to speak of? The famous 'one shot stopper'.
In post #7, you stated the following:
However lets get real, the .357 Magnum is slightly better than the 9 mm +P loadings. I doubt forensic pathologists can tell the difference between a 124 grain 9 mm(.355) wound and a 125 grain .357 wound. I also doubt you could tell much difference in effect given the same shot placement.
emphasis added
This appears to be a rather broad blanket statement about one caliber versus another. If, instead, you're talking about one particular loading (Federal 357B) in one caliber versus another specific loading (Speer 124grn +P Gold Dot) then I agree with you and have basically stated as much. However, as a broad blanket statement about one caliber versus another, there are several pertinent details which are omitted.
Additionally, I take minor issue with this statement also from post #7:
It will work, but they are marginally performing, old technology bullets. There are better choices now.
While I agree that the .357's in question are rather dated and that modern .357 are most likely better, I don't think that I would classify a 30 year old loadings that performs favorably in comparison to one of the very best modern 9mm loadings "marginal".
More to the point which one is the vaunted 'King of the Street' that some like to speak of? The famous 'one shot stopper'.
Looks like to me that the 'King of the Street' of song and legend was the old technology .357 bullet.
table omitted
As I said in post #4, I don't take the Marshall/Sanow data literally or as gospel (though I don't think it is completely without merit as most of the guys over at firearmstactical.com do). I merely mentioned it as a point of interest about the particular loading that the OP was asking about.
Also, Speer JHP does not necessarily refer to Gold Dot bullets. While the Marshall/Sanow data is rather dated, they specifically refer to CCI ammunition rather than Speer (while they're both owned by ATK, they are actually separate brands). The only Speer bullets currently loaded by CCI in their .357 Magnum ammunition (specifically Blazer and Blazer Brass) are the older Speer Uni-Cor Semi-Jacket Hollowpoints and not Gold Dots.
So again lets look at the FBI test results for that load. The Federal 357B.
Now the brassfetcher test of the 9 mm 124 grain Gold Dot +P. Just one shot will suffice.
Shot 3 - Impacted at 1218 ft/sec, penetrated to 14.3" and was recovered at 0.514" average diameter.
So lets see the 'King of the Street' comes out of a 3" barreled Model 13 @ 1265 fps, the 124 +P impacted @ 1218. Hum, thats pretty close, I guess the 9 mm +P needs to be dubbed 'Prince of the Promenade' or some other such drivel. lol Seriously though, given the above evidence, I just don't see how a reasonable person can believe that the effect of the old Federal 357B would be dramatically different from a 9 mm 124 grain +P load.
Table omitted
While the two may seem similar in velocities from short-barreled handguns, when fired from full-sized duty-type platforms (the types of platforms that the manufacturers use to determine published velocities) their ballistics are quite different. When we compare the factory published velocities of both loadings from 4" barrels (a fairly standard length for a full-sized service type revolver or 9mm semi-automatic) we see that the the Speer Gold Dot is listed at 1220fps while the .357 Magnum is listed at 1450fps. The similarities in velocity that you note between the FBI's .357 Magnum tests and Brassfetcher's 9mm tests are due to the 125grn .357 Magnum's inefficiency in short barrels due to slow-buring powder. Since no one here has ever specified a barrel length, this phenomenon could easily be offset by the fact that the 125grn .357 Magnum
gains much more velocity as barrel length increases due to slow-burning powders. If we look at Ballistics by the Inch's test results, we see that the Federal .357 Magnum loading achieved 1702fps from a 6" T/C Contender barrel while the 125grn +P Cor-Bon loading (the most similar ballistics to the +P Speer that was tested by BBTI) achieved only 1312fps. Also, even if the ballistics are the same, you fail to take into account the difference in bullet construction. Even with similar weights at similar velocities, two bullets with different expansion characteristics will perform differently from each other.
Bottom line, in my opinion the whole one shot stop study is a load of... lead.
Instead of boring you with a long statistical analysis; I'll just ask a few questions. Based on the one shot to the thorax criteria of the one shot stop theory.
Where is the data for the people shot more than once? The ones who were hit two or more times and kept going.
What about the people who were double tapped with a .45 ACP, or 9 mm and went straight down?
How do we differentiate psychological stops from physiological stops in the given data?
As I said before, I don't take the M/S statistics literally nor do I take the FBI/Fackler tests as gospel. However, I do think that we can draw some general conclusions from them. Even with dated JHP's, a .357 Magnum seems to be a very effective cartridge. Likewise, a 124-127grn 9mm at 1200-1300fps seems to also be a very effective loading. I don't believe that it is coincidence that so many of the same loadings that did well in the M/S study also performed adequately, if not admirably, in the FBI tests. What is odd, almost to the point of being comical, is that two separate studies can have so many similar results and come to such different conclusions. While Marshall and Sanow view kinetic energy transfer as the be-all end-all secondary only to shot placement, Fackler and the FBI decided that permanent crush cavity and penetration were the only important factors next to accuracy. The truth, as with so many things, probably lies somewhere in the middle.
Kinetic energy, I think, does play a role though not as large a one as Marshall and Sanow seem to think. While theories of Hydrostatic-Shock and the like seem to be scientifically unverifiable, it is known that the greater the amount of energy that is transferred into the target the larger the temporary stretch cavity will be. While Fackler and the FBI discounted temporary cavitation as a reliable wounding factor, even they admitted that it can have some effect on certain tissues (the human body is not homogeneous). So, while the effects of kinetic energy are much more localized than Marshall and Sanow believe, they can have significant effect on the human body if proper placement and adequate penetration are given.
What is often misunderstood, I think, about temporary cavitation is the great importance of not only where, but how it occurs. Aggressively expanding bullets which open very rapidly aren't really desirable because their temporary cavities, while usually very large in diameter, tend to narrow very quickly. Therefore, the temporary cavities of these bullets are causing most of their tissue damage near the outer surface of the body rather than deep into the vital organs where it is needed.
Likewise very deeply penetrating bullets that expand little or not at all aren't particularly preferable as while their temporary cavities narrow very gradually, they aren't particularly wide to begin with. Thusly, these bullets don't cause much tissue damage at all beyond their permanent crush cavities.
The most preferable type of bullet is one that expands well, but still penetrates deeply. The temporary cavity of this bullet, while not as wide as more aggressively expanding types, is still much larger in diameter than a non-expanding or poorly expanding bullet. Similarly, while the temporary cavity narrows more quickly than that of a bullet with little expansion, it does so more slowly than the extremely aggressive expander. In the end, you get a temporary cavity that has the most wounding potential deep in the internal organs where it will have the most effect.
So, the most preferable handgun bullet is one that expands well, penetrates deep, is placed accurately and has as much kinetic energy as possible without sacrificing any of the first three criteria. I don't think that it is coincidence that so many of the best loadings from both the Marshall/Sanow and FBI/Fackler studies fit the above mentioned template so well.