Long Range Hunting Online Magazine


Go Back   Long Range Hunting Online Magazine > Rifles, Reloading, Optics, Equipment > Gunsmithing


Reply

acceptable headspace growth for a 7stw???

 
LinkBack Thread Tools Display Modes
  #8  
Old 07-21-2014, 01:44 AM
Silver Member
 
Join Date: Feb 2008
Posts: 491
Re: acceptable headspace growth for a 7stw???

Quote:
Originally Posted by Edd View Post
There is a base to shoulder datum spec for a 7mm STW chamber and other belted case chambers. For the STW the minimum is 2.4697" and the maximum is 2.4797". That is measured at a shoulder diameter of .420".
Read my post again, I made no mention of the CHAMBER datum, only the dimensions of the BRASS, which are NOT held to these or any other dimension, if they were, they would all measure the same from every manufacturer, which they DON'T.

Cheers.
Reply With Quote
  #9  
Old 07-21-2014, 07:43 AM
Edd Edd is offline
Platinum Member
 
Join Date: Jan 2011
Location: Tulsa
Posts: 1,064
Re: acceptable headspace growth for a 7stw???

Quote:
Originally Posted by MagnumManiac View Post
Read my post again, I made no mention of the CHAMBER datum, only the dimensions of the BRASS, which are NOT held to these or any other dimension, if they were, they would all measure the same from every manufacturer, which they DON'T.

Cheers.
There is a base to shoulder datum spec for 7mm STW cartridge and other belted cases. For the STW the minimum is 2.4538" and the maximum is 2.4608". That is measured at a shoulder diameter of .420".

So based on the SAAMI specs, the acceptable growth from unfired new cases would be between maximum of .0259" and a minimum of .0089". The .020" the OP had is within that range.
Reply With Quote
  #10  
Old 07-23-2014, 10:51 AM
Gold Member
 
Join Date: Jan 2012
Location: Houston, Texas
Posts: 875
Re: acceptable headspace growth for a 7stw???

http://www.saami.org/pubresources/cc...rner.pdf#page1
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes


Current Poll
Do you archery hunt for elk?
YES - 32.27%
81 Votes
NO - 50.60%
127 Votes
Not yet, but I plan to. - 17.13%
43 Votes
Total Votes: 251
You may not vote on this poll.

All times are GMT -5. The time now is 10:06 AM.


Powered by vBulletin ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Management Powered by vBadvanced CMPS
All content ©2010-2014 Long Range Hunting, LLC