Long Range Hunting Online Magazine


Go Back   Long Range Hunting Online Magazine > Rifles, Reloading, Optics, Equipment > Rifles, Bullets, Barrels & Ballistics

Rifles, Bullets, Barrels & Ballistics Applied Ballistics


Reply

Case stretch

 
LinkBack Thread Tools Display Modes
  #1  
Old 08-07-2010, 05:39 PM
Platinum Member
 
Join Date: Aug 2005
Location: Murray, Ky.
Posts: 1,281
Case stretch

What is a normal amount of case stretch in a rifle that is headspaced correctly. Mine is stretching .005 just wandering if this is good or bad.


Thanks fellas,

Nathan
Reply With Quote
  #2  
Old 08-07-2010, 07:12 PM
Platinum Member
 
Join Date: Aug 2003
Location: NC, oceanfront
Posts: 3,370
Re: Case stretch

With a stiff load, or mid to long/skinny case, narrow shoulder angle, & FL sizing, I would think it's somewhat common. I have a friend that trims his 25-06 very regularly.

In contrast, none of my cases lengthen at all. My situation is just opposite above.
Reply With Quote
  #3  
Old 08-07-2010, 09:17 PM
Platinum Member
 
Join Date: Jul 2004
Location: Texas
Posts: 5,624
Re: Case stretch

Quote:
Originally Posted by nddodd View Post
What is a normal amount of case stretch in a rifle that is headspaced correctly. Mine is stretching .005 just wandering if this is good or bad.


Thanks fellas,

Nathan
You may be over sizing . After firing size just enough to be able to chamber. And then check
the growth of one of these rounds after fireing. If it still grows that much you may have to back
off on the powder charge.

If a round is sized properly and fired in a good chamber it should not grow very much unless
it is a hot load and then the chamber can grow enough that the brass will expand and
spring back will after firing and ejecting will be larger than the chamber.(This is the case when
you have heavy bolt lift.

J E CUSTOM
__________________
"PRESS ON"
Reply With Quote
  #4  
Old 08-07-2010, 09:50 PM
Platinum Member
 
Join Date: Aug 2005
Location: Murray, Ky.
Posts: 1,281
Re: Case stretch

I guess I shouldve explained it in different way, Im wandering if I have excessive headspacing or not. Using nosler brass in .243 win unfired then firing and measuring the shoulder of the 2 there is .005 diff. Of course the fired being longer. Just curious if .005 is normal or should it be less if headspaced correctly.

Thanks,
Nathan
Reply With Quote
  #5  
Old 08-07-2010, 10:35 PM
Platinum Member
 
Join Date: Oct 2009
Location: Thunder Basin, WY
Posts: 1,788
Re: Case stretch

I would think that .005" is very normal for a once fired case. I've seen that much expansion/stretch in alot of factory guns.

I am getting some custom dies built for a new wildcat. The die maker requires cases that have been fired 3 times to make the perfect die. This tells me that new, unfired cases are usually alot smaller than a chamber is. I believe the allowed varience in factory chambers (SAAMI specs) is .010" between go and no go. Therefore, new brass would have to be small enough to chamber in the SAAMI Minimum chambers.

I highly suggest an RCBS Precision Mic. It is a multiple use tool that will measure your headspace (off of a fired case), aid in setting up your FL die so it just barely bumps the shoulder, it will measure the Boltface to Lands in your gun, and also provide you with a tool to measure the cartidge Base to Ogive of a loaded round (so you can adjust the seating die for maximum accuracy)

I've been using them for many years in factory chambered guns. For the simple fact that some factory chambers are on the excessive side.
Reply With Quote
  #6  
Old 08-08-2010, 02:35 AM
Gold Member
 
Join Date: Apr 2009
Location: Carrollton, Ohio
Posts: 619
Re: Case stretch

Quote:
Originally Posted by nddodd View Post
Im wandering if I have excessive headspacing or not.
You need to use HEADSPACE GAGES (GAUGES) to find out..
__________________
"If you love wealth more than liberty, the tranquility of servitude better than the animating contest of freedom, depart from us in peace. We ask not your counsel nor your arms. Crouch down and lick the hand that feeds you. May your chains rest lightly upon you and may posterity forget that you were our countrymen."-- Samuel Adams
Reply With Quote
  #7  
Old 08-08-2010, 08:23 AM
SPONSOR
 
Join Date: Mar 2010
Location: on the Southern Plains
Posts: 1,205
Re: Case stretch

Quote:
Originally Posted by SBruce View Post
I would think that .005" is very normal for a once fired case. I've seen that much expansion/stretch in alot of factory guns.

I believe the allowed varience in factory chambers (SAAMI specs) is .010" between go and no go.

I've been using them for many years in factory chambered guns. For the simple fact that some factory chambers are on the excessive side.
The difference between GO & NO-GO in the .30/06 (and its cousins) is .006" For the .308 Win. (and its cousins) it is .004". The Weatherby Mags. is .003". The only way to check headspace is with fixed, tool steel gauges.
__________________
"Shoots real good!": definition; it didn't blow-up in my face. Not everything can be fixed on an internet forum!
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes


Similar Threads for: Case stretch
Thread Thread Starter Forum Replies Last Post
trouble with case stretch tomestone Reloading 28 01-24-2011 03:10 PM
How far can I stretch a 243?? kdog70 Long Range Hunting & Shooting 8 04-24-2009 12:18 AM
What can I do to this gun to make it stretch out ? Stainless Muzzleloader Hunting 15 08-08-2008 05:52 AM
primer pocket stretch coupalr Reloading 2 04-16-2006 10:40 AM
Time to stretch the Allen Mag legs lerch Long Range Hunting & Shooting 13 10-17-2005 08:32 AM


All times are GMT -5. The time now is 12:32 AM.


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