The Firing Line Forums

Go Back   The Firing Line Forums > The Skunkworks > Handloading, Reloading, and Bullet Casting

Reply
 
Thread Tools Search this Thread
Old March 10, 2015, 10:16 PM   #1
06shooter
Senior Member
 
Join Date: January 18, 2015
Posts: 165
Next question

For 3006 , a factory case is 2.042 " from shoulder to base.
Why does a once fired case measure the Same ?

When I go to full length size fired brass , will I need to set my die to put the shoulder back to 2.042 " from the shoulder to base when it begins to stretch ?
Thanks ?
06shooter is offline  
Old March 10, 2015, 10:22 PM   #2
Doyle
Senior Member
 
Join Date: June 20, 2007
Location: Rainbow City, Alabama
Posts: 7,167
I'm certainly no expert (and I'm sure one will come along shortly to give some better technical details) but what you are talking about is SAAMI spec for shoulder datum. If you are shooting an autoloader then bumping the shoulder back to that length is usually needed for the autoloader to feed correctly.

However, for a bolt action - you'll frequently hear about people just neck sizing. That is because they actually WANT their brass to stretch out. A chamber's size is seldom exactly SAAMI spec. It is usually longer. Letting the brass stretch out to better fit the chamber normally increases accuracy. Once you find out what the length of your particular chamber is, then you can set your dies to only bump the shoulder back to that particular length.
Doyle is offline  
Old March 10, 2015, 10:35 PM   #3
06shooter
Senior Member
 
Join Date: January 18, 2015
Posts: 165
OK thanks Doyle , I'm starting to get there ! And it is for a bolt action.
06shooter is offline  
Old March 10, 2015, 11:25 PM   #4
firewrench044
Senior Member
 
Join Date: July 9, 2007
Location: Fort Pierce, Florida
Posts: 381
I do not know where you got the 2.042 from ???

get out the loading book and check the dimensions
( most loading books have an picture with dimensions )

new factory cases will be way to small so it will go into any gun with that
caliber chamber

myself , I use a RCBS Precision Mic.
one of the tools in that kit measures the case, I use it to adjust the
sizing die a couple of thou. shorter than the chamber in the rifle I am
sizing for
firewrench044 is offline  
Old March 11, 2015, 04:39 AM   #5
Blindstitch
Senior Member
 
Join Date: April 14, 2013
Location: Milwaukee, Wisconsin
Posts: 2,685
The hornady handbook says 2.111.
Lyman 48 says 2.109
Speer 12 says 2.1086
Modern reloading says 2.109
Blindstitch is offline  
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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

Forum Jump


All times are GMT -5. The time now is 09:48 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
This site and contents, including all posts, Copyright © 1998-2021 S.W.A.T. Magazine
Copyright Complaints: Please direct DMCA Takedown Notices to the registered agent: thefiringline.com
Page generated in 0.04904 seconds with 10 queries