Long Range Hunting Online Magazine


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

Reloading Techniques For Reloading


Reply

Pressure with Neck-Sized Brass but not Full Length Sized Brass?

 
LinkBack Thread Tools Display Modes
  #1  
Old 11-24-2012, 11:03 AM
Silver Member
 
Join Date: Oct 2009
Location: Northeast MS
Posts: 364
Pressure with Neck-Sized Brass but not Full Length Sized Brass?

I have a load for my 280AI that shows no pressure with new or FL sized brass, however that same load with NS brass often shows an ejector mark. Both dies are bushing dies using the same bushing so neck tension should be the same. When FL sizing, the shoulder is set back 0.002". Any ideas what could cause this? Has anyone else experienced this?
Reply With Quote
  #2  
Old 11-24-2012, 01:00 PM
Platinum Member
 
Join Date: Jan 2012
Location: Houston, Texas
Posts: 1,018
Re: Pressure with Neck-Sized Brass but not Full Length Sized Brass?

Id say that your running pretty close to a maximum load. Now that the case isn't absorbing some of that boom by expanding your experiencing some high pressure signs. Have you shot any through a chrono for comparison.
Reply With Quote
  #3  
Old 11-24-2012, 01:01 PM
Platinum Member
 
Join Date: Apr 2012
Location: The cold part of Montana
Posts: 1,390
Re: Pressure with Neck-Sized Brass but not Full Length Sized Brass?

Put up a pic of the ejector mark. I'm wondering if it's just a shiny spot or if you have some brass extruded into the ejector hole. I it's the latter I'd say your loads are pretty hot for your gun. If the former then you'd be getting a press fit when you chamber a round. How is your extraction? resistance on the bolt lift, hard, no resistance?
__________________
Keep in mind the animals we shoot for food and display are not bullet proof. Contrary to popular belief, they bleed and die just like they did a hundred years ago. Being competent with a given rifle is far more important than impressive ballistics and poor shootability. High velocity misses never put a steak in the freezer.

Joe
Reply With Quote
  #4  
Old 11-24-2012, 02:15 PM
Silver Member
 
Join Date: Oct 2009
Location: Northeast MS
Posts: 364
Re: Pressure with Neck-Sized Brass but not Full Length Sized Brass?

Quote:
Originally Posted by Joe King View Post
Put up a pic of the ejector mark. I'm wondering if it's just a shiny spot or if you have some brass extruded into the ejector hole. I it's the latter I'd say your loads are pretty hot for your gun. If the former then you'd be getting a press fit when you chamber a round. How is your extraction? resistance on the bolt lift, hard, no resistance?
I'll put up a pic tonight of the mark. It is near max with H4831sc and 168vld, however velocity isn't very high-2815fps. Chambering and extraction are a little snug with the NS brass only.
Reply With Quote
  #5  
Old 11-24-2012, 06:58 PM
Platinum Member
 
Join Date: Aug 2003
Location: NC, oceanfront
Posts: 3,335
Re: Pressure with Neck-Sized Brass but not Full Length Sized Brass?

Do you have any REAL pressure signs?
Reply With Quote
  #6  
Old 11-25-2012, 08:58 AM
Platinum Member
 
Join Date: Dec 2005
Posts: 2,114
Re: Pressure with Neck-Sized Brass but not Full Length Sized Brass?

Right off the bat, I believe case head extruding into holes in the bolt face is a "real" indicator of pressure being too high. Typical cartridge brass starts to extrude at about 65,000 CUP to 70,000 CUP; that's about the same as about 85,000 PSI.

There has to be something different between your dies and techniques to cause that if the components are the same. Probably a dimension someplace. So you've gotta measure everything between the two sets of resized cases from each tool and process as well as the dimensions between the loaded rounds of each. Every detail dimension wise should be checked.
Reply With Quote
  #7  
Old 11-25-2012, 09:23 AM
Platinum Member
 
Join Date: Aug 2003
Location: NC, oceanfront
Posts: 3,335
Re: Pressure with Neck-Sized Brass but not Full Length Sized Brass?

He would have every pressure sign known with a 280 at 85kpsi & the subject would be all together different. That's not what's going on, and it doesn't seem to me like a real problem(so far).
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes


Similar Threads for: Pressure with Neck-Sized Brass but not Full Length Sized Brass?
Thread Thread Starter Forum Replies Last Post
Chambered Round Alignment to Bore; Neck Sized vs Full Length Sized Bart B Reloading 73 02-10-2014 01:48 PM
must I full length size new brass? sdoc Reloading 28 11-26-2011 04:54 PM
Help getting sized 1x fired brass to fit in chamber gearfoot Reloading 18 08-22-2010 08:27 AM
bullet run out on full sized cases Black Diamond 408 Rifles, Bullets, Barrels & Ballistics 7 07-28-2006 07:01 PM
FL sized brass wont eject? moosehunter Reloading 2 12-28-2005 11:05 AM


All times are GMT -5. The time now is 04:23 AM.


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