This is a discussion on Accuracy & Barrel Twist Data - 9mm within the MP Full Size Pistols forums, part of the Smith & Wesson MP Forum category; With reference to the may posts on barrels/accuracy/etc..... While I was doing research on a different subject I found three references that indicated the twist ...
| ||LinkBack||Thread Tools||Display Modes|
|June 24th, 2012, 08:42 PM||#1|
Join Date: Mar 2008
Accuracy & Barrel Twist Data - 9mm
With reference to the may posts on barrels/accuracy/etc.....
While I was doing research on a different subject I found three references that indicated the twist for a 9mm barrels shoud be about 1 in 10"!
1) ANSI/SAAMI Z299.3-1993
On PDF page 115 (Document Page 107)
The standard test barrel for pressure testing 9mm cartridges is a 1 in 10 twist.
This is found on the SAAMI.org site (Sporting Arms and Ammunition Manufacturers' Institute)
2) Glock Pistol Spec's for all Glock 9mm pistols is 1 in 250mm (9.84")
3) Wikipedia entry for 9x19 Parabellum indicates the same value as the the Glock spec above.
This is shown in the Cartridge Dimensions area of this post.
Twist rates for 9mm barrels seem to be all over the place from 1:10" to 1:24" with some of the longer twist rates provide good accuracy. This must not be the whole answer, but it is interesting that the 1:10" pops up at least three times and nobody says the 9mm Glocks shoot "Bad" groups because of it!
|June 24th, 2012, 10:06 PM||#3|
Join Date: Dec 2009
Location: Salish Sea
|July 1st, 2012, 05:28 AM||#6|
Join Date: Nov 2006
I understand S&W used the same twist for the 9MM that is used for the 40S&W. What's up with that? It's not like S&W never built a 9MM pistol before.
|Search tags for this page|
1:10 twist 9mm best ammo,
9mm 1 in 10 twist,
9mm barrel twist rate,
does saami establish barrel twist rate,
glock 17 pistols rate of twist,
glock barrel twist rate,
how many twists in barrel of smith and wesson m and p 9 mm,
optimal twist rate for 9mm accuracy,
pistol manufacturers use twist rate in 9mm handguns,
what is the best twist for a 9mm glock,
what is the twist rate for a glock 17 pistol barrel,
wjat is the best twist for a 9 mm barrel
Click on a term to search for related topics.
|Thread||Thread Starter||Forum||Replies||Last Post|
|M&P 9 Pistol Barrel Rifling Twist Ratio||harrison_creek||MP Full Size Pistols||19||October 8th, 2012 07:47 AM|
|Unusual Accuracy/Barrel Problem||Lefty Gunner||MP Full Size Pistols||5||June 20th, 2012 11:10 AM|
|Barrel Twist||lcbjr||MP Talk||4||December 10th, 2008 02:41 AM|
|AMMO AND BARREL TWIST||modavis7722||MP Rifles||2||July 3rd, 2008 04:13 AM|
|accuracy difference between a 16 and 20" barrel||banjo||MP Rifles||3||February 16th, 2008 05:19 AM|