Long Range Hunting Online Magazine


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

Reloading Techniques For Reloading


Reply

Lets talk about primer pockets

 
LinkBack Thread Tools Display Modes
  #1  
Old 06-03-2008, 08:54 AM
Silver Member
 
Join Date: Sep 2005
Location: Kalifornicated
Posts: 338
Lets talk about primer pockets

My .300 Weatherby seems to like hot loads; running Berger 210's at over 3000 fps (80.0 grains of 7828 .005 off the lands) I primarily use Weatherby brass and after 4-5 shots the primer pockets are pretty loose. I know the conventional wisdom is the brass is dead at that point, but why? Being a little curious I got my digital calipers out and took a few measurements.

Here is what I come up with:

.2100 (diameter of unfired Fed 215 primer)
.2080-2100 (diameter of a loose primer pocket)
.2060 (diameter of a tight primer pocket)

My question is why is the brass dead, if it is, when the primer pocket is loose. As long as the primer will stay in the pocket, good enough right !! I neck turn all my brass so it is not getting worked as much as a FL sizing would do. Anybody tried to "fix" the brass so the pocket would hold the primer?

John
__________________
USMC Scout Sniper 88-94
Instructor 1st. Mar. Div. SS school 91-94
Reply With Quote
  #2  
Old 06-03-2008, 08:59 AM
Platinum Member
 
Join Date: Jan 2007
Location: MS
Posts: 1,652
Like this?

MidwayUSA - R W Hart Case Saver Swage for Large Primer Pockets
__________________
I admit that I know just enough to be dangerous.....but dangerous at ever extending distances.
Reply With Quote
  #3  
Old 06-03-2008, 09:21 AM
Silver Member
 
Join Date: Dec 2007
Location: SW Texas
Posts: 285
???

So why is the loose as small or smaller than unfired? And how can tight be smaller than unfired? Are you telling me that the primer pocket actually gets smaller, narrower, after firing a mild load? Or am I just out of of it this morning???

And how does this punch thing work? Do you narrow the pocket by making it deeper? Is that what's happening above with a mild load?

OK, I am asleep!! 0.210 is diameter of primer, not primer pocket.

Last edited by Varminator 911; 06-03-2008 at 10:00 AM. Reason: Clear up my question
Reply With Quote
  #4  
Old 06-03-2008, 09:25 AM
Official LRH Sponsor
 
Join Date: Jun 2004
Location: Fort Shaw, Montana
Posts: 6,793
I have tested this quite a bit in my wildcats and more then anything in my 338 AM where the brass quality has declined a bit.

Its common to get spooked when you seat a primer and it seats with little pressure but I to asked is this really a problem.

My standard original load would loosen primer pockets up within 2 firings, noticably loosened. So I dropped the load back a bit for these cases, only 50 fps or so off the original velocity level.

Primer pockets would loosen up around 3-4 firings but they would still hold a primer. I continued firing the cases with this same load up to 6-7 firings and while the primer pockets were what would be considered very loose, there was still no gas leakage. I stopped at 7 firings as this is totally acceptable to me in this chambering, in fact 5 firings is what I was looking to attain.

In my opinion, if you are not seeing any gas leakage, your cases are still usable. For how long depends on the load and the brass. Many cases will expand on the first couple firings and then seem to stablize for several firings after that as far as primer pocket fit.

If your using loads that are leaving heavy ejector rings on your case heads, your pushing pressures pretty hard and your cases will not last as long so keep that in mind.

If your using a load within the specs of the cartridge your shooting, as long as the case is holding the primer with enough force that it can not move and you are not getting any gas leakage, go ahead and use them.

You can often see minute gas leakage if you take a bright light and look at the side walls of the primer pocket. If they appear matte finished at all, there is some gas getting around the primer cup lip. at times, this will only extend half way up the wall where it is then sealed off by the expanded primer cup. If the primer pocket wall is "matted" all the way up, your getting some gas leakage and generally you will see this on your bolt face.

Over time carbon will build up around your firing pin hole at best and at times you will get actual erosion in a ring around the firing pin on the bolt face. If your seeing this in any way, get new brass!!!

Kirby Allen(50)
__________________
Kirby Allen(50)

Allen Precision Shooting
Home of the Allen Magnum, Allen Xpress and Allen Tactical Wildcats and the Painkiller Muzzle brakes.

Farther, Faster and Flatter then ever before.

Web Page: www.apsrifles.com

allenmagnum@gmail.com
Reply With Quote
  #5  
Old 06-03-2008, 09:33 AM
Platinum Member
 
Join Date: Jan 2004
Location: Blackfoot, Idaho
Posts: 8,060
--[deleted]--

Kirby was quicker on the trigger this morning,

I do what Kirby does.
__________________
I may be the slowest guy on the mountain . . . . but . . . . I'm on the mountain!

Last edited by royinidaho; 06-03-2008 at 09:37 AM.
Reply With Quote
  #6  
Old 06-03-2008, 12:18 PM
Platinum Member
 
Join Date: Feb 2005
Location: USA
Posts: 2,598
Nothing wrong with 2 answers Roy.
__________________
range it,check the wind, dial in correction, aim and only one shot
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes


Similar Threads for: Lets talk about primer pockets
Thread Thread Starter Forum Replies Last Post
Lets Talk Primers Firecat Long Range Hunting & Shooting 32 12-16-2010 11:21 PM
Lets talk the SA and 338 bullets ICANHITHIMMAN Rifles, Bullets, Barrels and Ballistics 9 06-07-2010 09:54 PM
Lets talk .338 bullets angus-5024 Long Range Hunting & Shooting 43 01-14-2010 09:07 PM
Lets talk brands BrokenHorn The Basics, Starting Out 6 02-28-2006 04:57 AM
Lets talk best LR cartridge vs accuracy! Nighthawk Rifles, Bullets, Barrels and Ballistics 16 06-21-2004 01:53 PM

Current Poll
I currently have hunting preference points in the following states

All times are GMT -5. The time now is 05:33 AM.


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