Long Range Hunting Online Magazine


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


Reply

Internal ballistics frustration.

 
LinkBack Thread Tools Display Modes
  #1  
Old 12-21-2006, 02:10 PM
Platinum Member
 
Join Date: Jan 2003
Location: The rifle range, or archery range or behind the computer in Alaska
Posts: 3,500
Internal ballistics frustration.

To all,

I have given up trying to figure out this problem. Any ideas might help.

Problem:

When I use unfired brass and fire them 1 time with my top loads, which are not that hot, they extract perfectly. After I resize and reload the same cases (I full length resize them back to exactly what they are when new) and fire them again with the same load (bullet, powder, powder charge ect...) the extarction is somewhat difficult. The 3rd time they have to be tapped out with a cleaning rod after it pulls the sako style extractor apart from the bolt. Thank God I can reinstall it.

Any ideas??? Anybody else experianced this?

Rifle is a custom 300 RUM on a 700 action. Chamber is a tight neck .333 neck diameter. Brass is turned so that the loaded round 's neck is .331 and some are .330 Either one makes for the same problem.

Is it that the round just generates that much pressure that cases are only good for a couple shots or am I missing something?

I am also using Nosler brass. Remington brass isnt any better, in fact I can only get 1 firing out of them. The starnge thing is, it has only started doing this between the 400 and 500 round count.

Thanks for any thoughts.
__________________
Quote:
Originally Posted by Broz View Post
Please just answer one very simple question. Why would anyone shooting long range load a low BC , low SD 168 gr offering in a 300 win???????

My answer to this is. The only reason is to make the 7 RM look good. There is no other reason.

Jeff.
Reply With Quote
  #2  
Old 12-21-2006, 03:19 PM
Platinum Member
 
Join Date: Aug 2003
Location: NC, oceanfront
Posts: 3,124
Re: Internal ballistics frustration.

Couple things I wonder:
Do the offending cases rechamber without resizing?
If they do, how difficult is bolt closing/turning?
Do the cases tap out easily with a rod?
Has the brass been annealed below the the necks?
Has this extractor been worked on, or even disassembled by anyone?
Reply With Quote
  #3  
Old 12-21-2006, 04:01 PM
Platinum Member
 
Join Date: Jan 2003
Location: The rifle range, or archery range or behind the computer in Alaska
Posts: 3,500
Re: Internal ballistics frustration.

The offending cases meaning the ones that have to be tapped out. No they dont rechamber easily. VERY difficult. The new once fired brass chambers flawlessly. They do not come out easily with a rod but I dont have to hammer them out either. Brass has never been annealed at all and the extractor was installed by my local rifle smith who built the rifle. It is a sako style extractor, I forget the brand name of the components used.
__________________
Quote:
Originally Posted by Broz View Post
Please just answer one very simple question. Why would anyone shooting long range load a low BC , low SD 168 gr offering in a 300 win???????

My answer to this is. The only reason is to make the 7 RM look good. There is no other reason.

Jeff.
Reply With Quote
  #4  
Old 12-21-2006, 04:45 PM
Gold Member
 
Join Date: Oct 2004
Posts: 723
Re: Internal ballistics frustration.

Are you turning the necks every time you resize?
Reply With Quote
  #5  
Old 12-21-2006, 05:29 PM
Platinum Member
 
Join Date: Jan 2003
Location: The rifle range, or archery range or behind the computer in Alaska
Posts: 3,500
Re: Internal ballistics frustration.

I run them through the tuner, yes. After I full case size them I do it to ensure any brass that worked its way forward gets eliminated. Typically, after the first firing and resizing, I only need to do it during the second loading. I still do it after that though.
__________________
Quote:
Originally Posted by Broz View Post
Please just answer one very simple question. Why would anyone shooting long range load a low BC , low SD 168 gr offering in a 300 win???????

My answer to this is. The only reason is to make the 7 RM look good. There is no other reason.

Jeff.
Reply With Quote
  #6  
Old 12-21-2006, 05:54 PM
Platinum Member
 
Join Date: Jun 2001
Location: Potomac River
Posts: 5,057
Re: Internal ballistics frustration.

Have you checked to see if the case bases are still square after the first firing?
__________________
The Smokin Fur Rifle Club
Reply With Quote
  #7  
Old 12-21-2006, 06:49 PM
Platinum Member
 
Join Date: Jan 2003
Location: The rifle range, or archery range or behind the computer in Alaska
Posts: 3,500
Re: Internal ballistics frustration.

Not sure how to officially check that, but they appear to be OK.

I may have figured out at least part of this problem. Tell me what your opinions are of this.

New case from base to shoulder (using a comparator) is 3.990" Fired cases are 3.993" I had been bumping the shoulder back to 3.988" Do you think that has anything to do with this? Should I be setting the shoulder back any at all or less than I have been? I have already reset my die to bump it back only 0.001". Will see if that helps any.
__________________
Quote:
Originally Posted by Broz View Post
Please just answer one very simple question. Why would anyone shooting long range load a low BC , low SD 168 gr offering in a 300 win???????

My answer to this is. The only reason is to make the 7 RM look good. There is no other reason.

Jeff.
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes


Similar Threads for: Internal ballistics frustration.
Thread Thread Starter Forum Replies Last Post
Internal MOA adjustments BigPig069 Long Range Scopes and Other Optics 5 12-19-2009 09:01 PM
Mark 4 Internal MOA Uncle Z Long Range Scopes and Other Optics 4 08-09-2009 06:22 PM
.257 Frustration continues!!!!!!!!!!!!! 300winnie Rifles, Bullets, Barrels and Ballistics 19 11-27-2007 10:07 PM
Frustration and dissapointment!! Obsessed Long Range Hunting & Shooting 2 08-19-2003 05:59 PM
Bad Practice and Frustration Dave King The Basics, Starting Out 7 03-11-2003 08:37 AM

Current Poll
In the last 12 months, what was your longest rifle kill on big game?
0 to 200 yards - 25.92%
1,523 Vote
201 to 400 yards - 32.15%
1,889 Vote
401 to 600 yards - 23.08%
1,356 Vote
601 to 800 yards - 9.99%
587 Votes
801 to 1,000 yards - 3.91%
230 Votes
Over 1,000 yards - 4.94%
290 Votes
Total Votes: 5,875
You may not vote on this poll.

All times are GMT -5. The time now is 02:22 AM.


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