Which is better between the 357 sig and the 40 S&W and why?
Much depends on bullet design and specific loads, but generally .357 SIG is better at penetrating barriers, while .40 S&W pokes a bigger, often deeper hole into flesh, and can still penetrate barriers better than most people--even LEOs--would ever need. .40 S&W is usually more effective after penetrating barriers, as well--it just can't penetrate all of the barriers that .357 SIG can.
When barriers are not involved (aside from clothing), some contend that .357 SIG is more effective because of the "shock" (often described as hydrostatic, which is nonsensical) that it imparts due to its velocity and kinetic energy, but I don't buy that because it's not nearly energetic enough to have such an effect (and in comparative terms .40 S&W isn't that far behind in energy anyway).
.357 Sig might penetrate deeper, .40 might leave a bigger hole, they both do the same job.
I agree that they pretty much do the same job overall, but the subject of penetration is more complex than most would imagine. .357 SIG is generally more penetrative in hard, dry materials, but its velocity is within a range where velocity-penetration graphs start to look weird and non-linear when soft, wet media are involved. It seems to transfer energy and momentum faster than .40 S&W, and will generally penetrate less in such media unless expansion (in the case of hollow-point bullets) is more limited by the design of the bullet.
Most of us have probably heard about the phenomenon of 5.56x45mm rounds overpenetrating but doing relatively little damage (in comparison to their potential) when their velocities are too low, and pretty much exploding inside the body when their velocities are high enough. The same principle applies here, only that much less energy is involved and greater penetration for a given level of expansion is desirable (which favors the heavier, slower .40 S&W, in my opinion).
.357sig offers less recoil
But more blast & flash.
and (arguably) enhanced reliability by benefit of its bottle necked case Vis-à-vis the shorty forty.
Agreed in theory, although I'd like to see whether this is provable in practice to a significant degree.
Funny ... that during the "shortage" I was able to buy 357 SIG at Wal mart just about any time I wanted to. They have multi boxes on the shelf any time I go.
It's a quirk of supply & demand, I guess. Because the demand for .40 S&W is usually much higher, generally a greater selection and supply is made available by retailers. When demand is normal, supply tries to stay just ahead of it, but when demand is extremely high, supply inevitably cannot keep up, which has a greater impact on the products that are most in demand. It was relatively easy to do a full run of .357 SIG to keep up with its more limited demand (and if its demand were ever overestimated by manufacturers, then they probably had a decent supply in their warehouses), but there was just not enough time, equipment, and manpower to keep up with the demand for the more popular calibers. Adding to this issue was the fact that a fair number of people who carry or otherwise use .357 SIG for defensive purposes actually shoot more .40 S&W or 9mm FMJ practice ammo (through conversion barrels) because they're cheaper and usually more available (when demand is normal).
Skinny, that is a silly question. Everyone knows the 357SIG in a SIG226 platform is un-beatable. No debate. Everyone agrees.
That's absolutely correct--you don't even need to aim, or pull the trigger for that matter.
the FBI tested a 357sig round, and compared it to the GD 124gr +P 9mm. they found it to be no more effective. they had equal penetration and expansion.
That's in ballistic gelatin after passing through the various barriers specified in their test protocols--I guess the extra energy of .357 SIG just got dumped somewhere in these cases, eventually being converted into a small amount of heat (in other words, it went to waste). However, if stronger barriers were used in the tests, then .357 SIG would begin to pull away from all of the other autoloader service calibers. The question is whether this advantage is enough to overcome the advantages of the other calibers (usually decided on an individual basis): 9mm is easier for many to shoot well, and .40 S&W and .45 ACP are somewhat more effective per round even after penetrating the specified barriers. Some would argue yes, although the FBI test protocols are considered by many to be rather tough, as well as highly representative of real-world conditions.