I couldn’t find any hard evidence that high muzzle flash rounds actually do increase the likelihood of these psychological stops, but it’s nonetheless interesting. As we can see from the data, both .40 S&W and .357 SIG perform quite similarly in terms of penetration depth and average bullet diameter. Because no cartridge is perfect. The FBI had been steadily replacing .38 Special revolvers with 9mm at this point, but in the aftermath of the shootout the efficacy of 9mm was being brought into question. Yes, the 357 Sig ammo is more costly and less ubiquitous. 6) COST OF RELOADING – 357 SIG is less expensive than 40 S&W. So why didn’t law enforcement agencies and concealed gun carriers all across the country just adopt the .40 S&W and call it a day? This is a discussion on P320 in .357 Sig vs. .40 S&W within the P250, P320, & P320 X-5 Pistols forums, part of the SIG Sauer Pistols category; Originally Posted by pblanc I do not believe that "power factor" tells the entire story when it comes to perceived recoil. Both options had some loads stick in the FBI's sweet spot for penetration depth, though .357 SIG is more prone to overpenetration. Both are fairly snappy if shot from similar firearms. This combo resulted in a 125 grain bullet traveling at a velocity of about 1,400 feet per second. 40 S&W and the .45 ACP, you get no extra performance with the added recoil you get from those 2 rounds. The .357 Sig reigns supreme on these barrier penetration tests followed by the 9mm as a close second. What does the .357 Sig have that the .40 S&W doesn’t? A 357 SIG’s tendency to penetrate farther, however, may become an advantage when a target is … Nevertheless, .40 S&W and .357 SIG remain viable calibers for self-defense and for the sake of intellectual curiosity I thought it would be interesting to explore how these two cartridges stack up in a side by side comparison. Due to the similarities,.357 SIG guns can convert to.40 S&W with a barrel swap. Some folks refer to .357 Sig as a necked-down .40 Smith & Wesson. There's also fewer ammunition manufacturers with a line of .357 ammo. .357 SIG ist eine von SIGARMS in Zusammenarbeit mit Federal Cartridge 1994 entwickelte Patrone. If you are looking for Sig Sauer 40 Vs Sig 357 And Sig Sauer 516 Patrol With Flip Up SightsSig Sauer 40 Vs Sig 357 And Sig Sauer 516 Patrol With Flip Up Sights If you looking for special discount you need to searching when special time come or holidays. Created by the FBI specifically for law enforcement, the .40 S&W has been called “The perfect cartridge” for personal defense. It’s running out of the gun faster, and we all know what that means. So guys, which one is the bestest? So what happened with .357 SIG? Balistics sometimes calculate in some ways into propellant ratio to projectile weight. The final nail in the coffin for .357 SIG was the notable improvements in ballistics technology that led to the revolution of the 9mm cartridge. .357 SIG is also more accurate than 9mm and .40 S&W, but those calibers are accurate enough in most … So to combat this, they took the 10 mm cartridge (which debuted a few years earlier), necked down the casing to accommodate a 9mm projectile, and stuffed a 125 grain bullet in it. 9mm remains the cartridge to beat in the world of modern handguns, and until something truly revolutionary comes along, this will likely remain the state of things. The higher velocity and design of the projectile of .357 SIG vs .40 S&W helps it to carry to further distances without as much drop. Though this generally isn't really a concern for concealed carry or most defensive situations, it's worth mentioning. The 40 does OK. Modern magazines for either one should feed both types of rounds but be sure to check with your manufacturer. Something went wrong. It has been adopted by many state and federal law enforcement agencies and in fact, at its inception the Federal Borough of Investigations actually went to Smith & Wesson with their own specifications for what they wanted in a pistol cartridge. It takes one round less on average to incapacitate someone with .357 SIG compared to 9mm, .40 and 45), and it does so [incapacitate] 4-5% more reliable than 9mm, .40S&W, .45 ACP and even .44 Magnum (which over penetrates spending its energy advantage as the bullet leaves the body). 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