Page Index Toggle Pages: 1 Send TopicPrint
Normal Topic 32-40 --what rim thickness is best?? (Read 2529 times)
emmett22405
Full Member
***
Offline



Posts: 124
Location: Virginia
Joined: Sep 21st, 2009
32-40 --what rim thickness is best??
Sep 20th, 2015 at 9:06pm
Print Post  
Back with another gem.  Had an original Win 1885 highwall 38-55 rebarreled\rechambered/new breechblock  made into a 32-40-- simple, yes? Well...  have had 3 runs of 14, 18, and 7 rounds chambered, and fired and extracted since then. On many more the breechblock wouldn't close on, or if it did, King Kong had to open the breech after firing Couldn't figure out what was the problem, as I kept checking the cases that worked. Finally checked the cases that didn't. Lo, the cases that chambered (original 32-40 or reformed Win 38-55) had rim thicknesses of less than .0610; anything thicker no go.    3/4 of the brass I have either 32-40 or 38-55 reformed to 32-40 is .063 or MUCH thicker. COTW says the original 32-40 rim thickness was  .058, 38-55  30-30, and 32-40 current or recent past mfr are at least 0.63  as far as I can tell; my chamber's rim is less than . 060   To what depth should I have the rim recut?? What is working for y'all/
  
Back to top
 
IP Logged
 
Mike_Hunter
Senior Forum Member
****
Offline



Posts: 365
Joined: Nov 5th, 2008
Re: 32-40 --what rim thickness is best??
Reply #1 - Sep 21st, 2015 at 11:37am
Print Post  
When I cut 32-40 chambers, I shoot for .063-.065

There is quite a bit a variation in rim thickness

V/R

Mike
  

Mike Hunter
(You need to Login or Register to view media files and links)
Back to top
 
IP Logged
 
ledball
Oldtimer
*****
Offline



Posts: 831
Location: syracuse, ohio
Joined: Nov 20th, 2009
Re: 32-40 --what rim thickness is best??
Reply #2 - Sep 21st, 2015 at 4:48pm
Print Post  
why not make all your brass (rim thickness) fit your rifle, much easier than re-chambering.  Ledball
  
Back to top
 
IP Logged
 
jy3855
Senior Forum Member
****
Offline



Posts: 368
Location: California
Joined: Jul 13th, 2015
Re: 32-40 --what rim thickness is best??
Reply #3 - Oct 6th, 2015 at 4:31pm
Print Post  
SAAMI spec for the chamber is .063" minimum, 0.070" maximum, so I agree, shoot for .063-.065" chamber depth at the rim.

The bottom drawing has the chamber specs, top drawing is the cartridge specs (rim max 0.063")
(You need to Login or Register to view media files and links)
  
Back to top
 
IP Logged
 
JLouis
Frequent Elocutionist
*****
Offline



Posts: 6785
Joined: Apr 8th, 2009
Re: 32-40 --what rim thickness is best??
Reply #4 - Oct 6th, 2015 at 6:45pm
Print Post  
If you wish to acheive tight headspacing for target work only of which is conducive to accuracy it would be best if you used Ledball's approach.

JLouis
  
Back to top
 
IP Logged
 
bwdog
Junior Forum Member
**
Offline



Posts: 34
Joined: Mar 8th, 2015
Re: 32-40 --what rim thickness is best??
Reply #5 - Oct 6th, 2015 at 7:10pm
Print Post  
Starline brass that I just purchased to make 32/40 brass measures .0575 on the rim . It is the 38/55 long brass .
  
Back to top
 
IP Logged
 
CajunRebel
Oldtimer
*****
Offline



Posts: 625
Location: Alexandria, VA
Joined: Nov 18th, 2007
Re: 32-40 --what rim thickness is best??
Reply #6 - Nov 17th, 2015 at 7:36pm
Print Post  
Emmett - I ran into the same problem.  I was lucky to buy 300 pieces of Win .32-40 brass several years ago.  I cannot close my lever on any rim that is .061 or thicker.  I just pushed the thick rims aside, 15 from 200 pieces.
  
Back to top
 
IP Logged
 
Page Index Toggle Pages: 1
Send TopicPrint