S&W Fullsize 45 accuracy problem - MP-Pistol Forum

S&W Fullsize 45 accuracy problem

This is a discussion on S&W Fullsize 45 accuracy problem within the MP Range Reports forums, part of the Smith & Wesson MP Forum category; I took my new m&p full size 45 to the range today and shot 100 rounds of factory Federal 230gr fmj out of it and ...


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Old March 18th, 2010, 06:38 PM   #1
 
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I took my new m&p full size 45 to the range today and shot 100 rounds of factory Federal 230gr fmj out of it and its grouping 3 inches left and about 5 inches low at 15 yards. I couldnt believe the performance I was getting out of this m&p since I own 2 others and they group POA/POI. Anyone else here experience this with your M&P's?
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Old March 18th, 2010, 06:50 PM   #2
 
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Are your other m&p's 45's? If not, the heavier trigger of the 45 could be causing a trigger control issue. I have the 45FS too and it is dead nuts accurate.
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Old March 18th, 2010, 07:50 PM   #3
 
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No. This one is the only 45 m&p I have. The others I have are 9mm and only one has the Apex sear in it. I benched it so I know somethings wrong with it. I also noticed that the slide is very a loose fit to the frame. It rattles alot and way more than my other m&p's. not sure if that has something to do with it either
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Old March 18th, 2010, 09:32 PM   #4
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Quote:
Originally Posted by merc' post='248173' date='Mar 18 2010, 07:50 PM
No. This one is the only 45 m&p I have. The others I have are 9mm and only one has the Apex sear in it. I benched it so I know somethings wrong with it. I also noticed that the slide is very a loose fit to the frame. It rattles alot and way more than my other m&p's. not sure if that has something to do with it either


The M&P 45fs came into being from the possible military contract that had been put on the table and then taken off. Compared to my M&P 357 it is a little looser in fit. However, it has not affected the performance of pistol. I think this is mostly because the pistol was designed for field operations that it would encounter as a military sidearm. I would like to know if you are using the same size grip on it, that you have on your other M&P's? I am using the small on both my 45fs and 357fs. I noted that if I used a different size grip on one and a larger on my M&P 357 it did not point the same and vice versus when I tried the other way switching grips. The small grip was still different on the 45 due to its size and my point of aim is still different. Let me know if this helps.
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Old March 18th, 2010, 10:25 PM   #5
 
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Little bit more trigger finger and stronger wrist, dont slap the trigger.



My M&P .45 will put a round within a inch of iron sights at 15 yards. It is about as accurate as they come. Frightens me that the Storm Lake Barrel makes it more accurate than I could ever be. I find myself shooting very small sight in targets at 15 yards. I think the last one I shot at was so small, the front sight dot covered the entire target ring.



If you examine the manual for the weapon, you may find a small statement in there fine print where Smith and Wesson certifies the weapon to be accurate to within so much at so far downrange.



I use both a crimson trace and iron sights when I shoot and the weapon is accurate. Once I got past that point mentally that front sight floats into focus and the round is on it's way. I feel confident with it. But not enough to do any stunts like cutting cards like they do at shows.



Also I have noticed as you consistently fire rounds 200-500-1000 your groups will become very tight and consistent. In the beginning my spread could have been covered with a table cloth. Now it's about 2 inches across.
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Old March 19th, 2010, 08:09 AM   #6
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Quote:
Originally Posted by merc' post='248154' date='Mar 18 2010, 07:38 PM
I took my new m&p full size 45 to the range today and shot 100 rounds of factory Federal 230gr fmj out of it and its grouping 3 inches left and about 5 inches low at 15 yards. I couldnt believe the performance I was getting out of this m&p since I own 2 others and they group POA/POI. Anyone else here experience this with your M&P's?


Shooting left and high means you are right handed and you probably have your finger wrapped more around the trigger. Try just the pad of your finger and change the backstrap as mentioned earlier.



I would suggest to move the target in closer see where you are grouping and adjust accordingly. I have a FS .45 and it's dead nuts on, but I practice alot.



Please understand I'm not belittling you cause we all have been there and done that.
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Old March 19th, 2010, 09:51 AM   #7
 
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I have a FS 357 and a FS45. My FS 357 was dead on. My FS 45 shot 3 to 4 inches left at 25. I put the apex sear in both of mine. The 45 trigger was a lot worse than my 357. I don't have a gauge but would guess the apex sear cut the poundage in half. You could put your apex sear in the 45 and see it that helps. I have the 40/357 sear in my 45.
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Old March 19th, 2010, 11:57 AM   #8
 
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I have the Apex 45 sear in route already. Im just not sure as to why is shooting low at 15 yards. I benched the gun at shot groups at 15 yards and its way off. I only tried at 15 though. I'll try some closer and further ranges soon. I want to get this fixed ASAP. Im going to wait until I install the sear though.
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Old March 19th, 2010, 02:34 PM   #9
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All the above is great info.



You might also try changing ammo brands and check that too. My FS 45 isn't real picky (Remingtons are a bit so-so) Winchester does good and it likes my reloads just fine. But my 9's are a little different. Blazer shoots dead on. WWB shoots a titch low and it's a good thing Remington has fairly good brass (for reloading) or I wouldn't even buy their 9 mm. They (FS 45 & 9's) also handle "dirty ammo" quite well too.
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Old March 19th, 2010, 09:35 PM   #10
 
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so you move the rear sight to the right to correct windage. Try another weight of ammo.

Different bullet weights shoot to different points of impact and for that matter different brands sometimes do to.

If it persists in shooting low the usual fix is a lower front sight or to file some off the top of the front sight.

I'd be more concerned about how the pistol groups.
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Old March 20th, 2010, 05:21 AM   #11
 
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I had same issue when I got it a year ago,switched to largest strap so I could operate trigger with the tip of my finger with out feeling cramped,all is well now
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Old March 20th, 2010, 12:26 PM   #12
 
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My Full size FDE M&P45 has the PC action/trigger job and will shoot sub 1 inch groups out to 25 yards. My FS 357sig with the Apex Tac sear/plunger will do the same out to 50 yards but the 357sig is know for being a "straight" shooter at longer distances than most handgun rounds. I'd have another person shoot your 45 to see if they get the same results. If so you either need to adjust your sights or send it back to S&W. The loose fit you describe should not affect accuracy that much at distances less than 25 yards.
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Old March 22nd, 2010, 09:54 AM   #13
 
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I have the same issue when shooting my sig 228, it's smaller than the 1911's and MP45 that I'm used to and I shoot tight groups slightly low and slightly left with it, that's all my fault. If I only take the sig to the range I can correct the issue within 25 rounds and go from there but if I'm swapping between it and the .45's then it's a constant problem for me. It's just a size/fit issue. I don't carry the 228 so I don't worry about it.



Now off the bench it should print dead center, mine is from the bench or my hand so if you've sandbaged it and and it's still off then it might need a trip back to S&W. The loose slide to frame fit is odd too, mine is not loose at all. It's bigger than the 9 and 40 but not looser.
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