.357SIG or .40 S&W? - MP-Pistol Forum

.357SIG or .40 S&W?

This is a discussion on .357SIG or .40 S&W? within the MP Reference forums, part of the Smith & Wesson MP Forum category; I'm considering another M&P. Are the .357 and .40 frames and slides structurally identical? I ask because if they aren't, I would buy the stronger ...


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Old April 21st, 2012, 12:56 AM   #1
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I'm considering another M&P. Are the .357 and .40 frames and slides structurally identical? I ask because if they aren't, I would buy the stronger of the 2 and get a barrel in the other caliber.
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Old April 21st, 2012, 01:49 AM   #2
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Originally Posted by Jackalope View Post
I'm considering another M&P. Are the .357 and .40 frames and slides structurally identical? I ask because if they aren't, I would buy the stronger of the 2 and get a barrel in the other caliber.


The only functional difference between an M&P40 & 357 is the chamber in the barrel, all other differences are cosmetic i.e. the engraving.



Edit: I hate typos...
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Old April 26th, 2012, 12:45 AM   #3
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Identicle.



You'll shoot the .40 much more due to $$$$$$$$$$



I have a .357 barrel for my older Glock 22 and it hasn't been used in years.
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Old April 27th, 2012, 06:44 AM   #4
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Originally Posted by Jackalope View Post
I'm considering another M&P. Are the .357 and .40 frames and slides structurally identical? I ask because if they aren't, I would buy the stronger of the 2 and get a barrel in the other caliber.
You will be shooting the 40 more like Angel King said. However, I find the 357 a better self defense round for throwing less down range. Again, it all boils down to what you like and want. I myself would train with mostly 40 ammo and use the 357 for self defense. Both slides are the same as well as internals. The only difference on the barrels is what round they are chambered for. You can interchange barrels and nothing else needs to be changed on the guns. The only other difference you will find will be the recoil impulse between the guns. The 155 grain 40's are closer to the recoil of the 357 than the 180 grain loads. However, i say closer. Nothing compares to firing at least 50 rounds of the 357 loads. So, my suggestion would be to train with mostly 40 and fire at least 2 to 3 magazines of 357. I love my 357 fs and do actually fire mostly 357 loads with it. You can check out ammo seeker for the best prices. Or go to: http://www.sgammo.com/catalog/pistol-ammunition/357-sig to check out what they have.

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Old April 27th, 2012, 07:58 PM   #5
 
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this is a good read.









me...i'm very inpressed with my .357 sig in my m&p compact. if there is a down fall to this round its ammo cost. i reload so that helps keep prices managable. watch the sales and ammo costs are not that out of hand.



i had a chance to harvest a nice fat 152 lb. michigan doe last fall. the load was a 125gn. XTP traveling at a cronny measured 1385 fps. pretty stout for my compact but still safe. have a bit more room till max out. hit that doe broadside at 15 yrds. absolutly vegatized the lungs and blow the heart into chunks. very impressed. she didn't even twitch after the knock down.



this round has some very strong points for a defence choice.
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Old May 9th, 2012, 02:38 PM   #6
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That was a good read. The cost of factory ammo is the only reason I don't shoot it.



I had a Glock 33 chambered for it and I wish I never sold it. I'm just getting into reloading,



so maybe I'll give it another try.
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Old May 10th, 2012, 05:12 AM   #7
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Do you have to trim cases on 357sig?
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Old May 10th, 2012, 07:57 AM   #8
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Do you have to trim cases on 357sig?
Yes you do, and it's one of the hardest cases to reload. The short neck doesn't offer much of a hold on the bullet, so having a canalure and a factory crimp are good ideas to help reduce setback, an even better solution is when both are used together.
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Old May 10th, 2012, 11:34 AM   #9
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Thanks KR.
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Old May 10th, 2012, 11:42 AM   #10
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CDNN has the 357 fs for 399
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Old May 11th, 2012, 03:22 PM   #11
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Thanks KR.
No problem, you did me a favor in asking the question. It a great relief when some of these seemingly useless tidbits, jam packed inside my skull, can finally be vented off.



BTW, $399 is an awesome price for either a full size or compact M&P pistol.
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Old May 11th, 2012, 04:12 PM   #12
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yeah 399 is a nice price, wish I had found this befor eI ordered mt pistol a week ago.
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Old September 23rd, 2012, 06:19 PM   #13
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I bought the factory kit that was 357 sig with a 40 barrel grip inserts and three mags for one decent price of $485, the dealers were only allowed to order two of these kits one time only. I was very lucky to just be there at the right time, my dealer sold both kits in one day!
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Old September 24th, 2012, 03:50 AM   #14
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Get a .40 and then an aftermarket barrel in .357Auto. Shoot the .357 when you can afford it [or find it] but I suspect you'll mostly shoot .40.

The 357Sig is an interesting round and has some useful applications for law enforcement, but for sport or straight-up defensive use, I don't think it gains you much over the .40S&W.
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Old September 24th, 2012, 06:42 AM   #15
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I orginally purchased my M&P357Sig about Two and a Half years ago as my main carry weapon. I like both rounds(357Sig & 40S&W) so much so I got an aftermarket 40S&W barrel. Two calibers in one handgun cannot be beat and both have been flawless.
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