9mm in-accuracy - MP-Pistol Forum

9mm in-accuracy

This is a discussion on 9mm in-accuracy within the MP Talk forums, part of the Smith & Wesson MP Forum category; Is the 9mm round inherently less accurate than the 40 or 45 rounds or is it just a S&W thing? My M&P 9 FS is ...


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Old March 11th, 2016, 05:03 AM   #1
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Unhappy 9mm in-accuracy

Is the 9mm round inherently less accurate than the 40 or 45 rounds or is it just a S&W thing?

My M&P 9 FS is on it's 2nd trip to the mother ship right now due to very poor accuracy.
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Old March 11th, 2016, 10:12 AM   #2
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No. There are far too many variations even within the same manufacturer of a particular cartridge to make such a broad characterization.

You have to use the exact same ammunition as S&W is using when test firing the gun to draw any meaningful conclusions. Exact same manufacturer and bullet weight. Find out what it is, use that, shoot level and at the same distance they're using. Only after that can you begin to suspect something might be wrong with the gun.

I have heard, but have not personally confirmed, that a small nick, dent, or other imperfections at the end of the barrel will cause significant inaccuracy so investigate that too.
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Old March 11th, 2016, 10:47 AM   #3
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I've owned a couple of the 9mm 5" Pro series M&Ps, and each were decently accurate, but my 4.25" M&P40 Pro was noticeably more accurate.

If I still owned the M&P 9 Pros, I would probably change out the barrels to the new APEX Tactical barrels to assure that they were as accurate as possible.
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Old March 11th, 2016, 12:49 PM   #4
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I don't know. My Pro Series 9mm seems to be every bit as accurate as my Pro Series .40. Just saying!
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Old March 11th, 2016, 01:34 PM   #5
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I am no expert on this subject. But my experiences with 3 different platforms in 9mm have taught me that my reloaded ammo is much more accurate than any factory range quality ammo. I load all .356 dia bullets and the vast majority of factory is .355. For me, along with consistant powder charges, the diameter difference proves to be significant. My 2 M&P 4.25 inch 9mm's, and my Shield 9 are extremely accurate.
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Old March 11th, 2016, 01:50 PM   #6
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I'm not suggesting that your individual pistol might have a problem, but in my experience (10s of 1000s of rounds in MANY revolvers and pistols) most factory firearms shoot to a consistent point of aim (POA) IF the shooter holds that POA through a follow-through.

Lots of people read these threads, then start their own thread, "my XXXXX is terribly inaccurate". My now dear departed dad used to say, "a poor carpenter blames his tools". Again, I'm not saying that is the case for you, but for all others who want to pile on with "I have that issue too", maybe they need to look in the mirror and say "How good am I at grip, sight picture, sight alignment, focus on the front sight, followthrough, etc.?"
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Old March 11th, 2016, 03:43 PM   #7
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As I've said before in other posts: My 5" Pro was doing it's best to give me 5" groups at 25 yards, off a pistol rest. Once in a while, I'd get lucky and get 4" groups. I installed an Apex gunsmith fit barrel and my biggest groups are now 2". It's not unusual to shoot 1" groups, when the stars are aligned just right. The only ammo that gives me these groups are American Eagle 147 grain FMJ, as CCI Lawman 147 fmj opens up quite a bit. I've tried Prvi-Partizan 115 grain fmj and averaged 2.5".
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Old March 11th, 2016, 03:52 PM   #8
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I have had a 4.25" 40 Pro in the past and currently have a 4.25" 9 Pro, 40c, and Shield 9. My 9 Pro is every bit as accurate as my 40 Pro was. That being said, I am just as accurate with my 40c as the 9 Pro. I can consistently get 2-3 in groups at 25 yds. If I do it on a rest I can get the 9 Pro to 2" sub groups. The Shield on the other hand gets me 4-5" at 25 but that is expected. I can easily get 3 in at 9-12 yds. I typically use 124gr Speer Lawman at the range for my 9s and 180gr American Eagle for the 40c. I do see my accuracy slip some when shooting 147gr with my 9 Pro.


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Old March 11th, 2016, 05:52 PM   #9
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All my M&P's have been very accurate, even my old '07 M&P9.

That said; I've always shot 115gr jacketed, or 122gr cast TFP, in every 9mm pistol I've ever owned.

From what I've read on this forum; the 9mm accuracy issues of the older M&P's were when using heavier bullets.
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Old March 11th, 2016, 06:45 PM   #10
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What I learned from fitting the Apex barrel on my M&P Pro 9mm. The next time you look over a semi-auto centerfire pistol that you are thinking of buying, have a set of feeler gauges and a caliper with you. Take the slide off and remove the recoil spring. with the slide on its back; measure the end play and side play of the barrel in the slide. My Pro had .008 end play and .006 side play. When I fit the Apex barrel, it now has .0005 end play and under .002 side play. Put the gun back together and push down on the barrel and see how much movement you have. My Pro has many thousandths vertical movement. I had to remove about .015 from the Apex barrel lug during the fitting. It now has no movement and rather snug fit, when you close the slide. This fitting, if done right, will make your gun shoot much tighter groups. Don't forget to put some gun grease on the slide rails and barrel lug.
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Old March 11th, 2016, 09:23 PM   #11
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Unhappy

Thanks to all who have replied.

Regarding the shooter and shooting conditions-----my testing is done from a bench rest at 15 yards. I am experienced enough to precisely control trigger movement and maintain proper sight alignment until the shot breaks.

Regarding Apex gunsmith fit barrels--this would place the price of the pistol and barrel at near $700. I could have bought a Springfield Range Officer for that price.

I would be happy with consistent 3 inch groups at 15 yard. This would place the FS pistol on the same level as my 9mm Shield. The first barrel produced "shotgun patterns". The 2nd barrel showed signs of grouping but still way to large and in-consistent.

I guess I should have known better somehow.
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Old March 12th, 2016, 03:30 AM   #12
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Quote:
Originally Posted by donhudd View Post
.

Regarding Apex gunsmith fit barrels--this would place the price of the pistol and barrel at near $700. I could have bought a Springfield Range Officer for that price.
I paid $580 for my 9mm, 5" Pro. The Apex trigger kit was another $100 and the Apex barrel was $200, for a total of $880.

I could have bought a Walther PPQ, for a little less than the Pro and had almost the same accuracy and trigger pull I have now, without the add-ons.
Live and learn.
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Old March 15th, 2016, 09:43 PM   #13
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Quote:
Originally Posted by agksimon View Post
I paid $580 for my 9mm, 5" Pro. The Apex trigger kit was another $100 and the Apex barrel was $200, for a total of $880.

I could have bought a Walther PPQ, for a little less than the Pro and had almost the same accuracy and trigger pull I have now, without the add-ons.
Live and learn.
By using your logic I'm guessing you aren't a car guy. If you buy a car and update some of its parts, that madness the car more expensive. I see no problem with buying a gun and spending $200 on upgrades. If someone buys a camaro or mustang and buys a super charger or turbo for it, was the car not worth buying in the first place? Some people like the platform but aren't happy with a stock option.

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Old March 15th, 2016, 09:46 PM   #14
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This is my pro M&P 5". Would you say it's accurate standing at 7 yards?
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File Type: jpg target-small.jpg (79.4 KB, 52 views)

Last edited by G56; March 16th, 2016 at 09:13 AM. Reason: Fixed oversized photo
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Old March 16th, 2016, 01:02 AM   #15
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Almost everyone on our team can shoot quarter sized groups or less, at seven yards, offhand, slow fire. I just bought a Walther PPS M2 that will shoot nickel sized groups at that distance and an occasional dime sized, slow fire, if I do my part. Of course, My M&P 5 inch Pro will do it now too, with the new Apex barrel. Not every time, but a good share of the time.

Last edited by agksimon; March 16th, 2016 at 01:42 AM.
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