» Advanced

Go Back   Shooters Forum > Handloading > Handloading Procedures/Practices
Register FAQ Members List Donate Calendar Search Today's Posts Mark Forums Read



Reply
 
LinkBack Thread Tools Rate Thread Display Modes
  #1  
Old 06-22-2010, 03:57 AM
AJD AJD is offline
Registered User
 
Join Date: Feb 2010
Location: Fl Big Bend
Posts: 6
Necking down the 7 x 57


Registered Users do not see the above ad.


I am considering building a 6.5 x 57R and I am wanting to neck down the 7 x 57 to a 6.5, will the case require neck reaming or turning? Or can I just resize the neck and load?
Reply With Quote
  #2  
Old 06-22-2010, 04:17 AM
Davers's Avatar
Beartooth Regular
 
Join Date: Apr 2008
Location: Central Kentucky
Posts: 2,550
Quote:
Originally Posted by AJD View Post
I am considering building a 6.5 x 57R and I am wanting to neck down the 7 x 57 to a 6.5, will the case require neck reaming or turning? Or can I just resize the neck and load?
I used to have a rifle that I had rebarreled to 6.5 X 257 Roberts. Mostly I used .257 Roberts Brass but have used some 7 X 57 m/m Brass too. I never had to ream the neck or turn anything; I just full length resized and loaded.
Reply With Quote
  #3  
Old 06-22-2010, 04:17 AM
Beartooth Regular
 
Join Date: Feb 2003
Posts: 1,566
Off the top of my head, I vaguely remember Ken Waters trying that in his Pet Loads chapter on the 6.5x57, and he had problems doing it. Maybe the shoulder angle on the 6.5x57 is different? Or located slightly differently?
Sorry, that's all my feeble old brain will spit out, and I'm not where I can grab my copy of Pet Loads and look it up for you.
Needless to say, consulting Ken Waters Pet Loads would be a wise idea.
Reply With Quote
  #4  
Old 06-22-2010, 04:30 AM
AJD AJD is offline
Registered User
 
Join Date: Feb 2010
Location: Fl Big Bend
Posts: 6
I believe that is correct, IIRC the shoulder angle is different for the two cartridges. Which is why I would use the 7 x 57 and because I want a rim.
Reply With Quote
  #5  
Old 06-22-2010, 05:10 AM
The Troll Whisperer (Moderator)
 
Join Date: Jan 2003
Location: Mesa, Arizona
Posts: 19,710
Don't know about the 7x57R, but I have a 6.5x257 AI that uses plain old 7x57 brass necked down to 6.5 with no problems. haven't had to inside ream. Have turned the outside of the necks though I'm not sure it was really necessary.
__________________
NRA Benefactor Member
NRA Certified Police Firearms Instructor
NRA Certified Range Safety Officer
NAHC Life Member

"Firearms only have two enemies - rust and politicans" author unknown
Reply With Quote
  #6  
Old 06-22-2010, 05:28 AM
AJD AJD is offline
Registered User
 
Join Date: Feb 2010
Location: Fl Big Bend
Posts: 6
Sounds good, I didn't realize it, but it seems S & B load 6.5 x 57 rimmed. I'll look for some info on it.

What kind of velocity are you getting with your 6.5 x 57? I am thinking of using 120's and 130's mostly.
Reply With Quote
  #7  
Old 06-22-2010, 06:37 AM
unclenick's Avatar
Super Moderator
 
Join Date: Jan 2005
Location: Hilliard, Ohio
Posts: 10,846
Here's a side by side I pasted together from QuickLOAD's drawings. It looks like you have to neck down the 7×57R, trim, then blow the shoulder forward to go from 7 to 6.5. Whether you need to ream or not depends on your chamber's neck diameter. Most chamber reamers are little on the generous side for neck diameter unless you get a special one, so the extra brass could actually make it a better fit. Going by the difference in cross section area, If the 7×57R has a 0.014" thick neck, it would gain 0.001" in wall thickness if the brass all pressed inward instead of squirting up longer, which it will do. So I don't think that's going to leave you with much real thickness gain. Maybe half a thousandth or so. It is likely to be within tolerance for your chamber, but get a chamber cast or use a small hole gauge in the neck to be sure. Figure the chamber neck should be at least half a thousandth bigger at the end than the OD of the neck over a seated bullet. I would warn you about the dreaded donut if the 7×57R brass is used, but because the 6.5 neck is shorter than the 7 neck, any donut should end up in the shoulder, where it may be ignored.


__________________
Nick
__________________________
Orange Hat Family Member
CMP Certified GSM Master Instructor
NRA Certified Instructor
NRA Benefactor Member
"First contemplation of the problems of Interior Ballistics gives the impression that they should yield rather easily to relatively simple methods of analysis. Further study shows the subject to be of almost unbelievable complexity." Homer Powley

Last edited by unclenick; 06-22-2010 at 06:44 AM.
Reply With Quote
  #8  
Old 06-22-2010, 09:23 AM
AJD AJD is offline
Registered User
 
Join Date: Feb 2010
Location: Fl Big Bend
Posts: 6
Thanks for the info! I was concerned about a donut!!!

I put together one - dummy round - from a 7 x 57, and I like the looks of it. It would be in a SS so there is no mag length issues.

Thanks again!

Last edited by AJD; 06-22-2010 at 09:26 AM.
Reply With Quote
  #9  
Old 06-22-2010, 02:05 PM
The Troll Whisperer (Moderator)
 
Join Date: Jan 2003
Location: Mesa, Arizona
Posts: 19,710
AJD - I'm using the Hornady 129 gr SST bullet with IMR4350 and a standard primer for a chronographed velocity of 2950 fps.
__________________
NRA Benefactor Member
NRA Certified Police Firearms Instructor
NRA Certified Range Safety Officer
NAHC Life Member

"Firearms only have two enemies - rust and politicans" author unknown
Reply With Quote
  #10  
Old 06-22-2010, 04:39 PM
AJD AJD is offline
Registered User
 
Join Date: Feb 2010
Location: Fl Big Bend
Posts: 6
Thanks! That is where I want to be with a 130. I shoot a lot of 260, and this seems like it is just a tad faster. I really like the 260 BTW, I just don't need another, currently (4). So I figured to try something different, but almost the same.
Reply With Quote
Reply

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
What steps are involved in necking down a straight case tammons Wildcat Cartridges 6 12-22-2007 04:55 PM
Necking down 300 H&H from 375 H&H MMichaelAK Handloading Procedures/Practices 10 06-18-2007 10:15 AM
Necking down the 6.5 Swede Squint Wildcat Cartridges 11 08-08-2006 08:59 PM
necking down 444 marlin 35fan Wildcat Cartridges 6 02-25-2006 01:07 PM
necking up brass hubbard Handloading Procedures/Practices 11 11-27-2004 02:53 PM


All times are GMT -8. The time now is 10:55 PM.

< Contact Us - Shooters Forum - Archive >

 
 

All Content & Design Copyright © 1999-2002 Beartooth Bullets, All Rights Reserved
View Privacy Policy | Contact Webmaster | Legal Information
Website Design & Development By Exbabylon Internet Solutions
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.0 PL2