Changing M&P 40 to 357Sig

[waynesigmeister]

I am new to this board. I have a M&P in 40 cal. I have shot 9mm for the past 25 years and don't care for the recoil of the 40. I bought the 40 to use for armed/CCW work as I am a retired police officer (I carried a Beretta 92F for 20 of those years). Most security companies want you to carry the 40 cal pistol but I prefer the 9mm or 45ACP. I would like to know if the Sig357 recoil is greater or lesser than the 40 cal. Can I shoot the Sig357 without changing the barrel or do I need to buy a new barrel. Thanks for the info.

 

[colt_saa]

You need to buy a barrel chambered for 357SIG

The recoil is not more or less, it is different

Most shooter describe the recoil pulse of a 40S&W as snappy while the same shooters describe the recoil pulse of the 357SIG as more of a strong push

If you have doubts go to a range that rents firearms and try one out. Or talk to one of the Departmental/Academy instructors and see if then can let you shoot one from the training inventory or their personal inventory.

You might want to update your profile to show your location. If you were in South Florida, I would be happy to let you try various 357SIGs from the training inventory. I know that you are not by the 40 comment in regards to armed security. By Statute, in Florida, armed guards must stick with 9MM or 38 Special

BTW, Welcome to the Forum

 

[Coastie762]

As noted above, all you need to change is the barrel. The .40 and .357 Sig use the same magazines, and the recoil spring assemblies are also the same. Factory barrels can be found at Midway and Brownells, among other vendors for reasonable prices.

 

[Glock2740]

Are the .357 Sig barrels a drop in for the M&P40? And like Glock, I assume you can use your M&P40 mags just fine for the .357 Sig loads. I have a G23 (.40), that I bought a Lone Wolf .357 Sig barrel for. It dropped right in and shoots great. The .357 Sig round is a great round for sure.

 

[John Law]

The 357 Sig barrel is a drop in for the M&P40. I used a factory S&W barrel. The mags are marked 40 S&W/357. My opinion of the recoils is pretty much as stated above, what I noticed was that the 40 had a bit of a twist to it while the 357 was more a push and straight up. The other thing I found was that the 357 report is much louder.

 

[markush]

You need to buy a barrel chambered for 357SIG

The recoil is not more or less, it is different

Most shooter describe the recoil pulse of a 40S&W as snappy while the same shooters describe the recoil pulse of the 357SIG as more of a strong push

Yes all you need is the barrel but I'll disagree on one point...coming from 1911's in .45, which is definitely a push, I found my M&P .40 to be quite snappy. When I put the .357sig barrel in it it seems to be even more snappy and louder.

 

[WR Moore]

If no one has told you, the 357 Sig is a multipurpose weapons system. The muzzle flash and report do extra duty as illumination and distraction devices (flash bangs & flares). I've never fired one, but being on the line during multi agency training has been both enlightening and stunning.

 

[Carnage_7]

The recoil from a .357 Sig is significantly more than the .40 S&W. I have a M&P .357 Sig and an M&P .40 S&W.

 

[GRP17]

The .357 Sig is a nice round but the cost for ammo is is much more and the only reason I dont have a .357 Sig now.

 

[Houdini1953]

Still waiting for Midway to ship my back order for two Lake Storm 357 3.5 compact barrels for my M&P40c, I put one on credit and the other straight out of my bank account, it seems it will be another couple of weeks and in the meantime I am getting a small supply of 357 sig ammunition about 500 rounds to start

 

[gr8hntr]

i have the m&p 357sig c and bought the 40 barrel
yes the ammo is higher for the 357 so i practice with the 40 ball and then shoot a mag of the 357 just to make sure im back on target with it and then carry the 357 daily
i love the m&p more each time i shoot it

 

[The Sarge]

Felt recoil is perceived differently by each shooter. Preconceived thoughts also influence how recoil feels. Mention 357 anything and recoil is thought about. The flash and noise level add to this. In actual measurements the recoil impulse of the 357SIG caliber is less than the 40S&W. I shoot a lot of both calibers in SIGs and Glocks. I find the 357SIG tends to recoil more straight back and you are back on target faster than with 40. The recoil impulse is over quickly and I feel less recoil with 357SIG than 40. Bill

 

[markush]

Felt recoil is perceived differently by each shooter. Preconceived thoughts also influence how recoil feels. Mention 357 anything and recoil is thought about. The flash and noise level add to this. In actual measurements the recoil impulse of the 357SIG caliber is less than the 40S&W. I shoot a lot of both calibers in SIGs and Glocks. I find the 357SIG tends to recoil more straight back and you are back on target faster than with 40. The recoil impulse is over quickly and I feel less recoil with 357SIG than 40. Bill

I think I recall you saying this before and I'm not saying your wrong. But, I need to ask...who measured it, how did they measure it, and where can I find the "actual measurements" you speak of?

 

[The Sarge]

I think I recall you saying this before and I'm not saying your wrong. But, I need to ask...who measured it, how did they measure it, and where can I find the "actual measurements" you speak of?

Over on the SIGForum the topic of 40 vs 357SIG recoil comes up often. Also the question of wear and frame battering. I remember reading posts there giving numeric comparisons of the energy produced by both calibers in recoil. The 357SIG was less. I will search for this information you seek. Bill