This is a discussion on Twist rate of M&P 9mm? within the MP Ammunition forums, part of the Smith & Wesson MP Forum category; Hello, I'm starting to digest information on reloading and wondered what the twist rate on the 9mm M&P (w/4" barrel) is. I tried to use ...
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|March 14th, 2007, 03:53 PM||#1|
Join Date: Mar 2007
Twist rate of M&P 9mm?
I'm starting to digest information on reloading and wondered what the twist rate on the 9mm M&P (w/4" barrel) is.
I tried to use the trick where you see how much your cleaning rod rotates in the barrel. It appears to be about 1/8 of a turn over the 3.5" of rifled barrel length which would give a twist rate of 1:28. Does that seem right to any of you re-loaders out there?
I'm interested in matching up the bullet weight with the twist to get the best accuracy, but I can't find any info on the lengths of different manufacturers' bullets to be able to plug it into the formula.
Has anyone already done this work and/or have any recommendations for me?
|March 14th, 2007, 04:16 PM||#2|
Join Date: Sep 2006
The specs list almost everything except twist rate!
Capacity: 17+1 Rounds
Barrel Length: 4.25"
Front Sight: Steel Ramp Dovetail Mount - Tritium Sights Optional
Rear Sight: Steel Novak® Lo-Mount Carry - Tritium Sights Optional
Trigger Pull: 6.5 lbs.
Trigger Travel: Rest to Fire .300 in.
Trigger Reset: Approx. .140 in.
Finish: Slide and Barrel Black Melonite®, 68HRc
Overall Length: 7.5"
Material: Zytel Polymer Frame, Stainless Steel Barrel/Slide and Structural Components
Weight Empty (No Mag): 24.00 oz.
Overall Height: 5.5"
Sight Length: 6.4"
|March 14th, 2007, 04:27 PM||#3|
Join Date: Mar 2007
It's the same problem for bullets. There's no length listed for bullets on their manufacturers web sites. It sure makes choosing supplies more difficult.
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