Smith & Wesson Forum

Go Back   Smith & Wesson Forum > >

Notices

S&W Revolvers: 1980 to the Present All NON-PINNED Barrels, the L-Frames, and the New Era Revolvers


Reply
 
Thread Tools Display Modes
  #1  
Old 07-31-2020, 10:46 AM
Stingray77080 Stingray77080 is offline
Member
Question About J Frame Barrel Question About J Frame Barrel Question About J Frame Barrel Question About J Frame Barrel Question About J Frame Barrel  
Join Date: Mar 2020
Posts: 2
Likes: 2
Liked 0 Times in 0 Posts
Default Question About J Frame Barrel

Please forgive me if this seems like a dumb question, but I'm new to guns in general, and this is the only hand gun that I've ever owned.

I bought a 642 in .38 caliber a while back from a friend. It's a SPL+P. I bought some ammo for it this week and noticed that the cartridge fits in the cylinder just fine, and fits in the "back side" of the barrel. And just to get to know the gun better, I tried to fit the bullet in the front of the barrel. And to my amazement, it doesn't go all the way in. I took the ammo and gun back to the place I bought the ammo, and the guy there told me it's supposed to be like that to give the gun better accuracy.

Is this normal? Was the barrel actually designed with a taper in the barrel? I certainly don't want to fire the gun without knowing.

Thanks in advance.
Reply With Quote
  #2  
Old 07-31-2020, 10:58 AM
riverrat38 riverrat38 is offline
Member
Question About J Frame Barrel Question About J Frame Barrel Question About J Frame Barrel Question About J Frame Barrel Question About J Frame Barrel  
Join Date: Nov 2011
Location: La Conner, WA
Posts: 1,505
Likes: 3,835
Liked 1,108 Times in 553 Posts
Default

It should be tapered the other way, but, due to the tight fit of the barrel to frame threads, this is more or less normal. With lead bullets, there is actually a slight loss of accuracy, probably not noticeable in a M442. For best accuracy, it would be better if the taper was the other way around. But, that would be custom work.

Best,
Rick
Reply With Quote
  #3  
Old 07-31-2020, 10:59 AM
armorer951's Avatar
armorer951 armorer951 is online now
SWCA Member
Question About J Frame Barrel Question About J Frame Barrel Question About J Frame Barrel Question About J Frame Barrel Question About J Frame Barrel  
Join Date: May 2012
Location: Evansville, Indiana USA
Posts: 4,816
Likes: 254
Liked 6,805 Times in 2,379 Posts
Default

The portion of the revolver barrel at the extreme breech end or barrel extension is called the "forcing cone", which is a slightly larger and tapered opening to allow the bullet to enter the barrel. The barrel itself, while not tapered, is sized slightly smaller (usually .002" - .003") than the projectile....this constriction traps the expanding gasses behind the bullet, while the lands and grooves in the barrel impart a "spin" to the bullet for stabilization. The dimension between the "lands" in the barrel is referred to as the "caliber".....which is in your case .357".

Based on your description, your revolver barrel sounds normal to me. Hope you enjoy shooting your 642.
__________________
Ret LE, FA Instr, S&W Armorer

Last edited by armorer951; 07-31-2020 at 11:12 AM.
Reply With Quote
The Following 5 Users Like Post:
  #4  
Old 07-31-2020, 11:09 AM
Pine_Worker Pine_Worker is offline
Member
Question About J Frame Barrel Question About J Frame Barrel Question About J Frame Barrel Question About J Frame Barrel Question About J Frame Barrel  
Join Date: Oct 2007
Location: Central Texas
Posts: 728
Likes: 960
Liked 773 Times in 324 Posts
Default

Quote:
Originally Posted by armorer951 View Post
The portion of the revolver barrel at the extreme breech end or barrel extension is called the "forcing cone", which is a slightly larger and tapered opening to allow the bullet to enter the barrel. The barrel itself, while not tapered, is sized slightly smaller (usually .002" - .003") than the projectile....this constriction traps the expanding gasses behind the bullet, while the lands and grooves in the barrel impart a "spin" to the bullet for stabilization. Your revolver barrel sounds normal to me.
What 951 said! It is not a muzzle loader.
__________________
Pine_Worker
NRA Life Member

Last edited by Pine_Worker; 07-31-2020 at 11:10 AM.
Reply With Quote
The Following User Likes This Post:
  #5  
Old 07-31-2020, 11:48 AM
kaaskop49 kaaskop49 is online now
Member
Question About J Frame Barrel Question About J Frame Barrel Question About J Frame Barrel Question About J Frame Barrel Question About J Frame Barrel  
Join Date: Jun 2012
Location: Demon-class planet
Posts: 6,222
Likes: 23,520
Liked 6,652 Times in 3,063 Posts
Default

^^^what the others said. BTW, there are NO dumb ?s if you don't know something. That's the beauty of this forum. Good luck and good shooting!

Kaaskop49
Shield #5103
Reply With Quote
The Following 4 Users Like Post:
  #6  
Old 07-31-2020, 12:15 PM
torizus's Avatar
torizus torizus is offline
Member
Question About J Frame Barrel Question About J Frame Barrel Question About J Frame Barrel Question About J Frame Barrel Question About J Frame Barrel  
Join Date: Dec 2008
Location: USA
Posts: 491
Likes: 1,064
Liked 529 Times in 233 Posts
Default

Post a pic of the bullet/round you are using, the bottom end of the case that has the manufactures abbreviation and the caliber of the ammo is the only definitive way for someone to clearly advise you if that is the correct ammo.
Reply With Quote
  #7  
Old 07-31-2020, 12:21 PM
two-bit cowboy's Avatar
two-bit cowboy two-bit cowboy is offline
US Veteran
Question About J Frame Barrel Question About J Frame Barrel Question About J Frame Barrel Question About J Frame Barrel Question About J Frame Barrel  
Join Date: Jan 2016
Location: the hills of ol' Wyo
Posts: 4,062
Likes: 9,210
Liked 9,133 Times in 2,658 Posts
Default

Welcome aboard and to the revolver world.

Armorer gave you the expert answer, now go learn and enjoy shooting your 642.
__________________
Keeper of homeless Chiefs
Bob
Reply With Quote
The Following User Likes This Post:
Reply

Thread Tools
Display Modes

Posting Rules
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
K frame barrel compatibility question LonChaney S&W-Smithing 2 02-12-2017 12:34 PM
N Frame Barrel Question Dkrueger17 S&W Revolvers: 1961 to 1980 5 12-16-2015 04:59 AM
Heavy barrel K frame question 30-30remchester S&W Revolvers: 1961 to 1980 0 12-21-2014 06:39 PM
Barrel install Question on an N frame pred S&W-Smithing 29 01-24-2009 02:46 PM
442-2 J Frame barrel marking question. Shooter Ready? S&W Revolvers: 1980 to the Present 28 10-15-2008 09:10 AM

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 10:31 PM.


Search Engine Optimisation provided by DragonByte SEO v2.0.42 (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Smith-WessonForum.com is not affiliated with Smith & Wesson Holding Corporation (NASDAQ Global Select: SWHC)