[deemon328]

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 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?



Thank you!

 

[G56]

The specs list almost everything except twist rate!



Model: M&P

Caliber: 9mm

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.

Frame: Large

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"

Width: 1.2"

Sight Length: 6.4"



http://www.smith-wesson.com/webapp/wcs/sto...nt_category_rn=

 

[deemon328]

heh!

LOL, yep.



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.

 

[YukonGlocker]

The Hornady XTP 147gr. has been the most accurate out of mine.