115 or 124 grain during break-in period?

[StevenA9]

I picked up my M&P 9 FS two weeks ago, but haven't got to the range yet. What round is better to use during the break-in period, 115 grain or 124 grain?
And how many rounds constitute the break-in period?
Thanks.

 

[scattershot]

I don't think it matters, whichever one shoots best in your pistol. By the time you get a box of each though the gun, you'll know if it's dependable or not.

 

[Amp]

Any factory load will be fine.
Standard pressure might be better.

 

[OKFC05]

There is no specified break in time nor specific break in load.

I always clean, inspect, and lubricate a new gun, and disassemble and clean the magazines. I have found some unpleasant surprises, like gobs of lube, no lube, and mag springs backwards.

Then I shoot the new gun using my standard range loads, minor power 124gr is what I use, or use any good commercial load. I'd avoid bargain ammo and gimmicks.
Clean and inspect after each shooting session, and note any problems, marking a mag that acts up.
You may find, as I usually do, that the gun is A-OK from day one!

 

[Sunsetview45]

I use 115 but mostly because I like the less recoil feeling.


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[Ranger17]

I've only used 115 ammo in my MP 9's with no issues; and to be honest cant say i have noticed any change or improvement in a gun after any "break in" period.
Now, me improving as I get used to it? Sure, but that's another story lol

 

[MyDads38]

IMO, handguns should not NEED a break in period. All of my handguns (all S&W except my Ruger SR1911) have operated fine out of the box, provided they are cleaned and lubricated prior to the first range session. My Shield 45 was the only pistol I've taken to the range without doing this, due to time restraints from purchase till time range closed. And still, it operated flawlessly out of the box. Proper care, cleaning and maintainance are key in a pistol operating as it should, especially anything that is carried for SD. Any standard loading should be fine in your new M&P 9, some bullet weights may shooter better/tighter groups than others. Grab a few boxes and give them a try

 

[Arik]

Doesn't really matter which.

I don't buy into break-in. Modern guns don't need them.i just shoot. You can call it break in or wear and tear

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[seagullplayer]

I think after a 100 rounds or so my trigger got a little smoother and the gun was smoother/easier to rack. But it has worked without issue from the word go.

A critic could argue that I just got use to the trigger and it didn't change just my perception of it, they might be right...

I use 115 all the time.

 

[Virginia John]

Use what you plan to shoot and/or carry. Get used to the gun from your first shot. In fact, your first shot may be your best.

 

[reddog81]

BOTH!

If the gun needed to be broken in it wouldn't matter how much the bullet weighs...

 

[DataPimp]

Put 9mm ammo in the gun out of box of factory ammo. Shoot it. Have fun.

It matters not, what grain you choose.

 

[Tradewind36]

There is no break-in period. Clean and lube as per the manual, shoot and enjoy.

 

[ChiefStealth]

I think many people agree that the recoil springs are really stiff when the gun is new. They loosen up some over time. While those springs are stiff, it takes more energy (recoil energy) to operate them properly. So, while the gun is new, using ammo with more energy is good. Using ammo with less recoil is not good. Its not really the weight of the bullet that matters. Its the recoil energy.

 

[Rastoff]

Just in case you haven't got the message yet; there is no break-in period.

Shoot whatever load you want. Have fun with the gun and come back and tell us how much fun you've had.

 

[berudd]

Whichever is cheaper.

 

[Lee in Quartzsite]

I picked up my M&P 9 FS two weeks ago, but haven't got to the range yet.

What the other guys said....no break in required. Best bet is to spend some time reading the Owner's manual, and note that is says it has a Slide Stop, not a slide release. Most new shooters complain that they can't release the slide using the Slide Stop...that's because it isn't intended to be used that way. That's probably the first complaint made about the gun, then complaints about the trigger. The trigger gets better with use.

Enjoy your new gun!

 

[fallhunter]

I have not even shot my M&P 9 FS yet, just got it, but I am too excited and I just have to carry it. I am carrying 127gr +P+ in it, and I will shoot that as my defense load, so I will start it off right from the beginning. I don't really believe in break-in period with today's guns.

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[fallhunter]

I do believe in always shooting good ammo. None of the cheap **** they sell for $10 for like 100 rounds. Stick to good name brand ammo for the life of the firearm. Clean it after every trip to the range.

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[therewolf]

I prefer to use 115 grain...