Smith & Wesson Forum

Go Back   Smith & Wesson Forum > >

S&W-Smithing Maintenance, Repair, and Enhancement of Smith & Wesson and Other Firearms.


Reply
 
Thread Tools Display Modes
  #1  
Old 02-08-2020, 03:07 PM
CAJUNLAWYER's Avatar
CAJUNLAWYER CAJUNLAWYER is online now
Member
9mm conversion of a 38 spl cylinder 9mm conversion of a 38 spl cylinder 9mm conversion of a 38 spl cylinder 9mm conversion of a 38 spl cylinder 9mm conversion of a 38 spl cylinder  
Join Date: Feb 2005
Location: On da Bayou Teche
Posts: 14,509
Likes: 9,457
Liked 33,013 Times in 6,244 Posts
Default 9mm conversion of a 38 spl cylinder

Can one take a 38 spl cylinder and make it so it can shoot 9mm with moon clips. If this conversion is feasable, will the cylinder still be able to shoot 38's or will it forever be dedicated to 9mm
__________________
Forum consigliere
Reply With Quote
  #2  
Old 02-08-2020, 03:15 PM
armorer951's Avatar
armorer951 armorer951 is online now
Member
9mm conversion of a 38 spl cylinder 9mm conversion of a 38 spl cylinder 9mm conversion of a 38 spl cylinder 9mm conversion of a 38 spl cylinder 9mm conversion of a 38 spl cylinder  
Join Date: May 2012
Location: Evansville, Indiana USA
Posts: 4,408
Likes: 202
Liked 5,508 Times in 2,080 Posts
Default

Sure. This "conversion" is possible. See info here:

My 9mm 360J is now a convertible!

9mm conversion
__________________
Ret LE, FA Instr, S&W Armorer
Reply With Quote
  #3  
Old 02-08-2020, 03:43 PM
k22fan k22fan is offline
Member
9mm conversion of a 38 spl cylinder 9mm conversion of a 38 spl cylinder 9mm conversion of a 38 spl cylinder 9mm conversion of a 38 spl cylinder 9mm conversion of a 38 spl cylinder  
Join Date: Feb 2010
Posts: 5,232
Likes: 4,353
Liked 4,363 Times in 2,090 Posts
Default

In the old and older revolver sub-forums members continually post that WW II British .38 S&W cylinders converted to .38 Special by reaming them deeper make the .38 Special cases swell so bad that those revolvers should be avoided and have little value. A cylinder reamed to accept 9 mm makes .38 Special brass swell just as bad. Also making the 9 mm bullet pass unsupported through the .38 Special chamber before entering a too loose chamber throat then a too small bore is not going to improve accuracy. However, I have no doubt the 9mm bullets will still be accurate enough to satisfy a 5 yard expert.

BTW, S&W extractor rods are not strong enough to extract 5 steel 9 mm cases at once so you will not be able to use the least expensive 9 mm cartridges.
Reply With Quote
The Following User Likes This Post:
  #4  
Old 02-08-2020, 04:18 PM
Protocall_Design Protocall_Design is online now
Vendor
9mm conversion of a 38 spl cylinder 9mm conversion of a 38 spl cylinder 9mm conversion of a 38 spl cylinder 9mm conversion of a 38 spl cylinder 9mm conversion of a 38 spl cylinder  
Join Date: Jan 2010
Location: Kansas City area
Posts: 2,541
Likes: 8,276
Liked 3,751 Times in 1,469 Posts
Default

How is a .357 bore too small for a .355 9mm bullet?
__________________
Protocall Design
Reply With Quote
  #5  
Old 02-08-2020, 04:21 PM
Protocall_Design Protocall_Design is online now
Vendor
9mm conversion of a 38 spl cylinder 9mm conversion of a 38 spl cylinder 9mm conversion of a 38 spl cylinder 9mm conversion of a 38 spl cylinder 9mm conversion of a 38 spl cylinder  
Join Date: Jan 2010
Location: Kansas City area
Posts: 2,541
Likes: 8,276
Liked 3,751 Times in 1,469 Posts
Default

Quote:
Originally Posted by k22fan View Post
Also making the 9 mm bullet pass unsupported through the .38 Special chamber before entering a too loose chamber throat then a too small bore is not going to improve accuracy. However, I have no doubt the 9mm bullets will still be accurate enough to satisfy a 5 yard expert.
How is a .357 bore too small for a .355 9mm bullet?
__________________
Protocall Design
Reply With Quote
  #6  
Old 02-08-2020, 04:41 PM
Sevens Sevens is online now
Member
9mm conversion of a 38 spl cylinder 9mm conversion of a 38 spl cylinder 9mm conversion of a 38 spl cylinder 9mm conversion of a 38 spl cylinder 9mm conversion of a 38 spl cylinder  
Join Date: Mar 2015
Location: Ohio
Posts: 4,429
Likes: 4,224
Liked 6,530 Times in 2,517 Posts
Default

I’m also sure that it’s possible and viable for modern guns but I’ll be the first to mention that it needs to be mentioned () that 9mm runs nearly twice the pressure of .38 Special.

Keep that in mind for old guns or shoddy imports.
Reply With Quote
The Following 2 Users Like Post:
  #7  
Old 02-08-2020, 04:53 PM
Hondo44 Hondo44 is online now
SWCA Member
9mm conversion of a 38 spl cylinder 9mm conversion of a 38 spl cylinder 9mm conversion of a 38 spl cylinder 9mm conversion of a 38 spl cylinder 9mm conversion of a 38 spl cylinder  
Join Date: Oct 2007
Location: California
Posts: 15,286
Likes: 6,426
Liked 13,754 Times in 5,838 Posts
Default

You can have the rear cyl face cut for moon clips, no problem.

But I would not ream the chambers for 9mm, I'd hone the rear of the chambers just enough to accept the 9mm cases. Then they won't be unduly oversize for 38s.
__________________
Jim
S&WCA #819
Reply With Quote
The Following User Likes This Post:
  #8  
Old 02-08-2020, 05:51 PM
muddocktor's Avatar
muddocktor muddocktor is online now
Member
9mm conversion of a 38 spl cylinder 9mm conversion of a 38 spl cylinder 9mm conversion of a 38 spl cylinder 9mm conversion of a 38 spl cylinder 9mm conversion of a 38 spl cylinder  
Join Date: Oct 2014
Location: South Louisiana
Posts: 4,730
Likes: 9,557
Liked 7,676 Times in 2,731 Posts
Default

Better yet would be to buy another cylinder to modify to 9MM and get it fit to the frame of your gun. That is basically what Ruger did with the convertible Blackhawks. One cylinder for 38/357 and another for 9 MM.
Reply With Quote
The Following 2 Users Like Post:
  #9  
Old 02-08-2020, 06:03 PM
k22fan k22fan is offline
Member
9mm conversion of a 38 spl cylinder 9mm conversion of a 38 spl cylinder 9mm conversion of a 38 spl cylinder 9mm conversion of a 38 spl cylinder 9mm conversion of a 38 spl cylinder  
Join Date: Feb 2010
Posts: 5,232
Likes: 4,353
Liked 4,363 Times in 2,090 Posts
Default

Quote:
Originally Posted by Protocall_Design View Post
How is a .357 bore too small for a .355 9mm bullet?
While the European philosophy has been to let bullet metal displaced by the lands fill grooves that are over bullet diameter Americans have traditionally pursued best accuracy by firing bullets that start at groove diameter or in the case of cast bullets a little over groove diameter. I only wrote that the conversion is not going to improve accuracy. If you have no interest in getting the best accuracy out of your guns then we have little common ground for discussion.

Quote:
Originally Posted by muddocktor View Post
Better yet would be to buy another cylinder to modify to 9MM and get it fit to the frame of your gun. That is basically what Ruger did with the convertible Blackhawks. One cylinder for 38/357 and another for 9 MM.
9 MM Blackhawks infamously do not get the best accuracy with lead bullets. That can be improved by reaming their 9 MM throats then reloading 9 MM cases with .38 bullets.

I created a .38 Special / 9 mm convertible by having a Model 60 .38 cylinder fitted to my Model 940 9 mm. It is not as easy a job as members imply. S&W does not intend the cylinders of even consecutive serial numbered revolvers coming off the line one after another to be interchangeable. If the barrel has to be set back to reduce B/C gap with one cylinder then the other cylinder has to be faced off in a lathe etc., etc.

Last edited by k22fan; 02-08-2020 at 06:14 PM.
Reply With Quote
The Following 3 Users Like Post:
Reply

Thread Tools
Display Modes

Posting Rules
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Model 25-2 w/ Conversion Cylinder? Tony2much S&W Revolvers: 1961 to 1980 39 07-29-2017 03:35 PM
Reloading for 45 conversion cylinder deanodog Reloading 7 07-27-2017 02:28 PM
Who has Cylinder & Slide Conversion? Protected One Firearms & Knives - Other Brands 7 12-02-2014 11:16 AM
.32-20 cylinder conversion? Babalooie S&W-Smithing 10 05-06-2012 01:54 PM
.22 Mag to .22 LR conversion cylinder for 351C? Young Disciple Smith & Wesson - The Wish List 5 09-03-2010 05:11 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 04:18 PM.


Search Engine Optimisation provided by DragonByte SEO v2.0.42 (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
S-W Forum, LLC 2000-2020
Smith-WessonForum.com is not affiliated with Smith & Wesson Holding Corporation (NASDAQ Global Select: SWHC)