If you could only choose one...

[twyacht]

Can anyone give me good reason to avoid .357sig?

The ONLY reason, is ammo availability. 5/10/15/20 years from now, your kids/grandkids, etc,....whoever the gun goes too,...will the caliber phase out and be a cult favorite like the 10mm or 41 magnum? (I don't know just askin'),...

Or is another caliber going to "always" be around.  I know we like to think we can get bullets "anytime", but what will be around if some political agenda makes it tough?

I have concerns with the .45ACP, also, as it's an "American" round, what happens than if it's prohibited? (I know reloaders will be the black market)....

but,....

357Sig is and always will be a great round, M+P is a familiar platform to you, and it's a damn good one.

My .02 cents....

tw

[garand4life]

if .357sig goes out of availability I can always buy a .40c barrel and put it in the 357c slide

[TexGun]

Even with headphones, they are VERY LOUD !!! Louder to me than full house .357 mag out of a 3" revolver. Other than that, good cartridge.

I'll echo m25, louder than HELL.  I shot my step son's this past week.  

Also, if you stray from the M&P, take a look at a refurb Sig 229.

[twyacht]

Isn't .357 sig a necked down .40?

Heck, if the ammo becomes unavailable, just have the chamber reamed to .40.

Necked down to a 9mm bullet size...ballistics are quite a bit more substantial....With the availability of drop in barrels, I sure would consider a drop in .40 barrel for sure.

[1911 Junkie]

Necked down to a 9mm bullet size...ballistics are quite a bit more substantial....With the availability of drop in barrels, I sure would consider a drop in .40 barrel for sure.

Dumb statement. I need to remove that. 

I guess it doesn't do any good to ream the chamber if the bullet won't fit down the barrel. Duh!

[Sponsor]

[Timothy]

Ballistics for the .357 Sig are damn close to .357 Mag numbers.  Great cartridge and might be my next aquisition so let me know how that M&P shoots with it......and of all the shortages, I would always see some on the shelves.

[garand4life]

I know are local shops have .357 sig in gold dots and such. plus I just had 100 rounds of winchester whitebox dropped in my lap so no worries there for the first trip out.

[fightingquaker13]

Can anyone give me good reason to avoid .357sig?

I'll give you two. Price and easy availabilty if you're in east nowhere on a road trip or SHTF at home. But you knew that when you bought the first one. Personally, I view it like 10 mm. Ballistically it's a great catridge, but it didn't catch on enough to be affordable and common. BUT, if mags are interchangeable with your M@P, and you like the gun, that's a huge plus.
FQ13
PS I guess it boils down to this for me. I am not as paranoid, err, I mean mentally prepared, as some members of this board. But I am a child of the '80s who grew up in the Cold War with Red Dawn, The Day After etc. I base my defensive (hell, all my firearms) choices based not on what is ballistically the best round, but on what is good enough to do the job and widely available. The"default calibers" are classics for a reason and I know I can find ammo in any Wally World (or self respecting Tx. convience store ). This does mean I sacrifice some oomph and accuracy, but I know that odds are good that no matter where I am, or how bad things get, I can probably find .556, 12 gauge and 9mm. Just my .02 YMMV

[Walter45Auto]

If you already have a M&P and like it, why not stick with a sure thing?

+1 Since you already have the M&P why not keep it consistent? I mean unless you just absolutely want something else.

[Two Guns]

I picked the Sig only because that is the gun I would get for myself.You might be better off with the S&W because that is what your primary gun is.