.357 Sig

[cd228]

What I've always found peculiar about the M&P357 and the stories of how they just couldn't get them to run properly is that every civilian I've ever heard from who owned one or otherwise converted their M&P40 to .357 SIG reports that they've never had an issue with theirs.

So either civilians simply haven't shot their M&P357s (or converted M&P40s) enough for the issues to manifest, or otherwise their was simply user error involved with the police officers causing their M&P357s to malfunction (limp wristing, perhaps?) and when Smith & Wesson got them back finding no discernable issues they just decided to go ahead and discontinue the line due to low sales.

That being said, if anyone here owns an M&P357 (or converted M&P40) with a high round count, then I would be most interested in hearing their experiences, seeing as I've heard nothing but positive feedback from civilians who shoot .357 SIG out of their M&Ps, but then again, I've never heard from one who shot tens of thousands of rounds.

While I don't disagree with you, there is another possibility. Was there any unique elements to the configuration that S&W or the ammo company provided to the police? S&W has modified guns to agencies requirements before (NYPD 3914 and 5946), and some ammo companies have made specific loads for agencies (Speer NYPD load, Treasury Loads,etc.). It's possible that the issue was caused by something not duplicated by civilian shooters.

NYPD's early issued with the mass issued Glocks (not the ESU guns) come to mind, as does the S&W P99.

 

[ladder13]

I have heard that Speer is no longer going to make .357 sig ammo... I am pretty upset and not too sure how accurate this is but I own 10 handguns in this caliber and its on my hip as my EDC.... You cant go wrong with 357 sig, 10mm and 41 magnum

That’s why I recently bought two cases from a dept ditching their 357 for 9mm and less than the price of the GDHP’s themselves. I may have to go back and get some more.

 

[colt_saa]

Since we are comparing .357 Sig to .357 Magnum can somebody please post velocities of the .357 Sig with 158 and 180 gr. bullets?

As I am certain you are aware, the 357SIG cartridge does not have factory ammunition with the projectile weights that you have mentioned. I am not too sure who is comparing the 357 Magnum to the 357SIG cartridge in this thread. After all, the cartridge was never intended to be a alternate for the 357 Magnum cartridge

At the time of its development, it was clearly stated that the intention was to provide the same performance of the number one, all time best, single shot stopping cartridge's load when carrying a auto loader. That cartridge was the 357 Magnum, 125 grain SJHP load from Remington which, on the average, moved out of a 4" revolver at 1450 FPS

Winchester's, 125 grain, SXT Ranger ammunition moves out of a full size auto loader at an average of just over 1400 FPS. The same ammunition when fired from a short barreled auto loader like the SIG P239 still moves out at roughly 1350 FPS on the average

Spears 125 grain Gold Dot leaves a full size auto loader at 1425 FPS on the average. I do not have chronograph results from the shorter guns in my notes, sorry. I guess I need to take some of the Gold Dot ammunition out with the short barreled pistols and my chronograph to correct that error

I think the designers reached their stated goal. Many Federal, State and Local Law Enforcement agencies also believe that the cartridge reached its stated goals.

The reason for the bottleneck cartridge is to provide more powder capacity while still keeping the cartridge short enough to work in 9MM sized frames. There are other auto loading cartridges capable of achieving the same ballistic goals, but they need to be chambered in longer firearms such as the 1911. This is not a good plan for Agencies which always include small males or women due to their smaller hands. Not everyone has big old paws like I do

While the cartridge was officially added to SAMII in 1994, it was actually in evaluation and development for many years before that. I was first exposed to the cartridge in 1993 when it was being tested by a State agency.

 

[Echo40]

I have heard that Speer is no longer going to make .357 sig ammo... I am pretty upset and not too sure how accurate this is but I own 10 handguns in this caliber and its on my hip as my EDC.... You cant go wrong with 357 sig, 10mm and 41 magnum

That's disappointing news if it happens to be accurate, but fortunately there are other brands which produce the ammo, and frankly I've always felt that Gold Dots were overrated. Besides, with any cartridge that isn't mainstream, reloading for the cartridge is an unfortunate yet rewarding necessity.

That being said, I believe that sometime within the next 5-10 years the .357 SIG might find itself in a similar situation as 10mm Auto, especially considering that there already exists a growing number of individuals who have recently discovered the cartridge and have been impressed by its performance. Over the past three years or so, I've been seeing a lot of videos featured by prominent content creators on YouTube performing various ammo tests with .357 SIG who have since become fans of the cartridge, so I think it's likely that ndw firearms/ammo will eventually eventually be produced in response to popular demand.

 

[swsig]

I've finally got one of my own!

My brother just presented me with a truly splendid Birthday Gift, a KKM .357 SIG Conversion Barrel for my Smith & Wesson M&P40 Compact.

I bought him one last year on his Birthday for his Glock 22, so he decided to return the favor.

Hopefully it will "run." The NC State Highway Patrol equipped its Troopers with the S&W M&P in 357 Sig and they never could get them to work reliably. They were quickly replaced by Sig P229's and S&W quietly dropped the 357 Sig from the M&P line.

I converted my EDC 1.0 M&P 40 Compact to .357 SIG with a Storm Lake (R.I.P ) conversion barrel. I've run nearly 3,000 rounds of Lawman and Gold Dot .357 SIG through it without a single malfunction. KKM has a good reputation, so I expect it will work just as well for you.

CAVEAT: I did try some Sellier & Bellot .357 SIG hollow points rated at 1475 fps, and my little 40c's recoil spring couldn't handle it. The slide moved so fast and violently that the trigger sometimes wouldn't reset. A brand new recoil spring didn't help. So, I'm sticking with Gold Dots as my carry ammo.

 

[paknheat]

Has anyone tried the .357 SIG conversion barrel for the .40 M&P made by Ed Brown?

I was thinking about getting one to try.


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[Doug M.]

If you want a 1911 with 357SIG performance and 38 SUPER capacity, 9x23 Winchester is the way to go

This cartridge will easily move a 125 grain jacketed projectile out of the 5" 1911 in excess of 1450 feet per second

I currently have 5 firearms chambered in 9x23 Winchester with 2 of them being Smith and Wesson Model 627 revolvers

*
Is that a handload only proposition?

 

[colt_saa]

*
Is that a handload only proposition?

When I built the first gun Winchester was offering several loads in 9x23 Winchester, but that was decades ago.

Since I have been a hand loader, going back to the 1970s after I had a supply of brass I stopped buying factory ammunition. So I'm not certain what is still available but there probably is some at least from the small boutique companies.

Brass is still available from Starline but they are not calling at 9x23 Winchester, I think they call it 38 Super Comp. The name that Starline uses actually went through two or three changes over the years. Years ago one of the larger commercial distributors of components decided to stop carrying Factory original 9x23 Winchester brass and I bought everything they had remaining. So even to this day I still have several thousand pieces of virgin 9x23 Winchester brass

You cannot use 38 Super brass for these loadings as the cartridge operates at 55,000 PSI

 

[Norton 750]

Yes, Wilson Combat mags for the 40 S&W. This combo has been reliable as a stone ax. After decades with the Wilson Combat mags for the 1911 both for fun and carry, I have a LOT of faith in them.

 

[Malysh]

It's because it's not a very good subcompact or compact round, not much gained over 9mm with a lot more blast and flash. And too many loadings are really at 9mm+P power levels (probably for this reason) making it redundant.

Patently false.