147 Gr bullet peformance - Page 2 - MP-Pistol Forum

147 Gr bullet peformance

This is a discussion on 147 Gr bullet peformance within the MP Reloading forums, part of the Smith & Wesson MP Forum category; I have switch to a 124grn bullet in my 9mm M&P pro (storm Lake Barrel) 147 grain does not group like 124 does out of ...


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Old September 8th, 2015, 08:08 AM   #16
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I have switch to a 124grn bullet in my 9mm M&P pro (storm Lake Barrel) 147 grain does not group like 124 does out of my gun, I have tried different loads with the same results
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Old September 8th, 2015, 11:54 AM   #17
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My tightest groups (3 inches) at 25 yards, off a rest, are American Eagle 147 grain FMJ flat point. I've tried everything else, including CCI Lawman 147 grain FMJ and all the 115 and 124 grain too. Groups opened considerably.
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Old September 8th, 2015, 02:15 PM   #18
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Fact be known, some bullets just shoot "better"... Its not a "fault" of the weapon, all weapons will have there "preferences".

One reason I *love* reloading, when I build a recipie that is fast and accurate, thats all I load! My 180gn .40 run 880fps and are consistently POA/POI... Maybe not as fast as some factory loads, but it shoots like a dream! Speed is nothing if your not hitting your target...

EB
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Old September 8th, 2015, 02:22 PM   #19
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147 Gr bullet peformance

The twist rate was increased on the new barrels for the exact issue your seeing. Customers were complaining about issues with accuracy and stability out of the heavier loads. Toss in one of the new barrels and I would bet your issue disappears.

Old barrel on top. New on the bottom.



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Last edited by GhostRecon21; September 8th, 2015 at 02:25 PM.
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Old September 8th, 2015, 05:53 PM   #20
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Does anyone carry the new S&W barrel with the 1-10 twist for the 9mm Pro? You can PM me or reply here
Thanks
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Old September 8th, 2015, 06:15 PM   #21
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Quote:
Originally Posted by Canuck44 View Post
Shooting the Lyman 147 gr bullet out of my M&P FS and Pro 9MM is giving me fits. The bullet won't stabilize. At 10 yards they show signs of tumbling and at 15 yards they are going through targets sideways. These same cartridges out of my CZ., STI and Tanfoglios run just fine. The latter three guns all have 1 - 10 rifling while my M&P's run 1 - 18.

I size the bullets .357 and use a soft commercial lube.

The M&P's shoot the 125 gr bullets just fine no issues and accuracy is very good.

Is this just a case of the M&P's having to slow a rifling twist?

I have heard the new M&P's were getting a 1 - 10 twist but have been unable to confirm.

Take Care

Bob
It sounds like your alloy may be a bit soft, and the bullet is stripping on the rifling.
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Old September 8th, 2015, 06:46 PM   #22
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Originally Posted by G56 View Post
I read something about a lot of the manufacturers are changing the twist rate on the 9mm, I can't remember which way it was going, just that they were changing to a twist that has become recognized as better able to stabilize more bullet weights. Interesting that Storm Lake still sells their aftermarket barrels with the old twist, when virtually the entire rest of the market has changed over.
I believe that the Wilson Combat 9mm M&P barrels have a 1-16 twist rate, and they work fine in the two pistols I've installed them in.
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Old September 9th, 2015, 08:42 AM   #23
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From what I've read, tumbling, at least with 9mm, usually has to do with too tight a crimp. On 9mm, you should be just removing the bell with your seating or crimping die.

My 9L likes Acme 147g flat points over 3.7 grains of ETR-7. They seem to be more accurate at the slightly higher velocity. My mix ran 136 PF at the last sectional match. It does equally well with 3.7 grains of Power Pistol under 147grain blue bullet flat points but they are a tad slower.
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Old September 14th, 2015, 11:37 AM   #24
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I called S&W CS and purshased 1:10 barrel for my M&P. I had called a couple of times. One CS person said they don't sell barrels then I called again about a week later and they sold me one.
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Old January 17th, 2016, 07:10 AM   #25
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I found accuracy is much better with .356 lead or plated vs. .357 (M&P 9 Core 1:10).
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Old January 19th, 2016, 02:16 PM   #26
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Have you slugged your barrel? Have you tried other weight lead bullets.
ALWAYS slug your barrel.
In general, if your groove diameter is 0.355-0.356, then you should be shooting 0.357-0.358" cast lead bullets.
Keyholing is USUALLY caused by bullets too small in diameter for that barrel, so you might want to try a slightly larger bullet.
I prefer 0.356-0.357" jacketed bullets and 0.357-0.358" lead bullets in all my 9x19s.
Per SAAMI, 9x19 jacketed bullets should be 0.3525-0.3555" in diameter (this is ONLY for the industry, reloaders can vary). Groove diameter per SAAMI is 0.355-0.359", and I have seen larger.
To see if your loading technique is an issue, take a few loaded rounds and pull the bullets and measure their diameters and measure the actual diameter of your "virgin" bullets. Diameter should be unchanged and pulled bullets should not have any crimp rings.
Very unlikely alloy is the problem (I shoot 8-12 BHN in all my guns and have no problems with leading or stripping the rifling), but:
Do you have leading and, if so, where is it (or where does it start)?

Twist rate: For 115gn bullets, the twist rate should be at least 1/38; for 124gn bullets, at least 1/36; and for 147gn bullets, at least 1:30. Bullseye shooters trying to use 9x19 in competition, use 115gn bullets and twist rates slightly greater than 1:30.
If your problem was over-stabilization, the 1:10 twist rate barrels would be the problem. There is no way a 1:16 twist rate is too slow for 9x19.
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Old January 21st, 2016, 11:22 AM   #27
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Originally Posted by coltlover View Post
Just loaded up some 147 Rainer bullets w/ some Titegroup powder. Should be around 855fps. We'll see how they shoot in a day or two. Will be trying them in a 9mm Pro. Hoping it will be a viable load for 3 gun competition.
I use "bluebullets"(coated lead) ,147grn with titegroup power (3.1grn) and don't have an issue with a 9mm pro
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Old January 22nd, 2016, 04:15 AM   #28
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More info: Also shooting 147 gr plated Berry's and Extreme at .356" dia. for 3" groups. Tried .357" and groups went to 6". (Shooting 147 gr LRN out of M&P Core (1:10) using 3.7 WSF good groups (3") at 25 yds)
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Old January 22nd, 2016, 08:49 AM   #29
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Quote:
Originally Posted by GhostRecon21 View Post
The twist rate was increased on the new barrels for the exact issue your seeing. Customers were complaining about issues with accuracy and stability out of the heavier loads. Toss in one of the new barrels and I would bet your issue disappears.

Old barrel on top. New on the bottom.
Do these marks also apply to the Shield barrel? Was there ever a twist rate change on the Shield 9mm?
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Old January 22nd, 2016, 09:06 AM   #30
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I installed an Apex gunsmith fit barrel in my 9mm, 5 inch Pro, when they came out in early December. My 25 yard group sizes went from a best ammo average of 3.5 inches to somewhat under 2 inches.

I might put my factory 5 inch barrel with 2 dimples, (gun made in July 2015) up for sale. If anyone is interested, let me know.
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