Smith & Wesson Forum

Go Back   Smith & Wesson Forum > >


Reply
 
Thread Tools Display Modes
  #1  
Old 03-19-2017, 09:16 AM
bluetopper's Avatar
bluetopper bluetopper is offline
Member
27-2 Twist Rate for 38 HBWC 27-2 Twist Rate for 38 HBWC 27-2 Twist Rate for 38 HBWC 27-2 Twist Rate for 38 HBWC 27-2 Twist Rate for 38 HBWC  
Join Date: Feb 2008
Location: Northeast TX
Posts: 700
Likes: 219
Liked 181 Times in 103 Posts
Default 27-2 Twist Rate for 38 HBWC

I acquired a very nice 27-2, 8 3/8" barrel and benchresting 38 wadcutters it doesn't group them as well as it should at 25yds. I'm quite disappointed.
Shooting jacketed bullets at near max loadings it shoots one hole groups.
I'm thinking the barrel twist rate might have something to do with this.
Does anyone know?
Reply With Quote
  #2  
Old 03-19-2017, 09:30 AM
muddocktor's Avatar
muddocktor muddocktor is offline
Member
27-2 Twist Rate for 38 HBWC 27-2 Twist Rate for 38 HBWC 27-2 Twist Rate for 38 HBWC 27-2 Twist Rate for 38 HBWC 27-2 Twist Rate for 38 HBWC  
Join Date: Oct 2014
Location: South Louisiana
Posts: 1,960
Likes: 3,231
Liked 2,262 Times in 933 Posts
Default

My old 4th edition of the Hornady reloading manual used an 8 3/8" 27 for load development. They have the twist rate listed as 1 in 18 3/4 inches in the book.
Reply With Quote
  #3  
Old 03-19-2017, 09:36 AM
Alk8944's Avatar
Alk8944 Alk8944 is offline
Member
27-2 Twist Rate for 38 HBWC 27-2 Twist Rate for 38 HBWC 27-2 Twist Rate for 38 HBWC 27-2 Twist Rate for 38 HBWC 27-2 Twist Rate for 38 HBWC  
Join Date: Jan 2007
Location: Sandy Utah
Posts: 5,776
Likes: 501
Liked 3,158 Times in 1,523 Posts
Default

The twist rate for nearly all center-fire S&W revolvers is 18 3/4", including all target types such as the K-38. The only exception is the .44 Magnum guns. Twist rate is not the problem is your gun does not shoot wad-cutters well.
__________________
Gunsmithing S&W since 1961
Reply With Quote
The Following User Likes This Post:
  #4  
Old 03-19-2017, 10:03 AM
TAROMAN's Avatar
TAROMAN TAROMAN is offline
US Veteran
27-2 Twist Rate for 38 HBWC 27-2 Twist Rate for 38 HBWC 27-2 Twist Rate for 38 HBWC 27-2 Twist Rate for 38 HBWC 27-2 Twist Rate for 38 HBWC  
Join Date: Jan 2010
Location: The wet side of Oregon
Posts: 5,340
Likes: 5,624
Liked 5,180 Times in 1,738 Posts
Default

If it's any consolation, my 8 3/8" 27-2 didn't shoot them well either.
__________________
-jwk-
US Army '72-'95
Reply With Quote
  #5  
Old 03-19-2017, 10:18 AM
OKFC05 OKFC05 is offline
Member
27-2 Twist Rate for 38 HBWC 27-2 Twist Rate for 38 HBWC  
Join Date: Aug 2007
Location: Oklahoma
Posts: 7,044
Likes: 1,602
Liked 3,059 Times in 1,445 Posts
Default

I have "cured" some revolvers that were inaccurate with HBWC lead bullets by cleaning ALL the copper fouling out of the barrel and then shooting nothing but lead for the evaluation. After some fouling shots, the miscreant revolvers settled down and shot normal HBWC loads well. Some shot my loads well, but did not like the owner's loads; HBWC don't like higher speed and may even separate into two parts.
__________________
Science plus Art
Reply With Quote
  #6  
Old 03-20-2017, 12:56 AM
Frank46 Frank46 is offline
US Veteran
27-2 Twist Rate for 38 HBWC 27-2 Twist Rate for 38 HBWC 27-2 Twist Rate for 38 HBWC 27-2 Twist Rate for 38 HBWC 27-2 Twist Rate for 38 HBWC  
Join Date: Sep 2010
Location: New Iberia, Louisiana
Posts: 3,141
Likes: 16,816
Liked 1,555 Times in 913 Posts
Default

I have a Douglas barrel blank and 1x14twist 38 special is stamped on the breech end of the barrel. Colt twist rates were pretty close to 1x14 twist. Maybe one reason Colt barrels were used on the Smython conversions on S&W revolvers. Frank
Reply With Quote
  #7  
Old 03-20-2017, 02:47 PM
bluetopper's Avatar
bluetopper bluetopper is offline
Member
27-2 Twist Rate for 38 HBWC 27-2 Twist Rate for 38 HBWC 27-2 Twist Rate for 38 HBWC 27-2 Twist Rate for 38 HBWC 27-2 Twist Rate for 38 HBWC  
Join Date: Feb 2008
Location: Northeast TX
Posts: 700
Likes: 219
Liked 181 Times in 103 Posts
Default

From what all I can read other places a 14 twist stabilizes 148gr HBWC and 180gr cast bullets a lot better than factory 18.75 twist.
Also all aftermarket 38 and 357 barrels that I know anything about are 14 twist.
Reply With Quote
  #8  
Old 03-21-2017, 12:52 PM
bluetopper's Avatar
bluetopper bluetopper is offline
Member
27-2 Twist Rate for 38 HBWC 27-2 Twist Rate for 38 HBWC 27-2 Twist Rate for 38 HBWC 27-2 Twist Rate for 38 HBWC 27-2 Twist Rate for 38 HBWC  
Join Date: Feb 2008
Location: Northeast TX
Posts: 700
Likes: 219
Liked 181 Times in 103 Posts
Default

I just talked to Clark Custom Guns this morning and they said they install only 1/12 twist barrels on all the 38 and 357 barrels they install. They said the factory S&W barrel twist of 1/18.75 is too slow to stabilize wadcutters well.
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Help with rate of twist Aussie Bruce S&W Revolvers: 1961 to 1980 2 03-05-2014 10:48 AM
M59 twist rate forestswin Smith & Wesson Semi-Auto Pistols 1 02-10-2014 08:38 PM
twist rate of M+P .40 machz1 Smith & Wesson Semi-Auto Pistols 14 12-11-2012 01:59 PM
Rate of twist Jebus35745 S&W-Smithing 6 05-04-2010 08:53 PM
204 twist rate pownal55 Reloading 3 03-09-2009 02:41 PM

Powered by vBadvanced CMPS v3.2.3
smith-wessonforum.com tested by Norton Internet Security smith-wessonforum.com tested by McAfee Internet Security

All times are GMT -4. The time now is 08:03 AM.


S-W Forum, LLC 2000-2015
Smith-WessonForum.com is not affiliated with Smith & Wesson Holding Corporation (NASDAQ Global Select: SWHC)