The Firing Line Forums

Go Back   The Firing Line Forums > The Skunkworks > Handloading, Reloading, and Bullet Casting

Reply
 
Thread Tools Search this Thread
Old May 10, 2013, 07:48 PM   #1
Colorado Redneck
Senior Member
 
Join Date: January 6, 2008
Location: Northeast Colorado
Posts: 1,993
What happens when a primer is pierced or blown out of the pocket?

I have several hundred CCI #550 small pistol magnum primers, and am considering working up a load using these in 204 Ruger. Reason---primers are darned scarce, so using these as backup would extend my supplies.

Having never experienced a primer fail (pierce or blow-out) it would be helpful for peace of mind to know what is the worst that can happen. Evidently some members are confident that CCI #550 are equivalent to CCI #400 (SRP). I worked up a load using #550 with the 222 Remington, and the primers looked fine, but 204 Ruger is a higher pressure round. The rifle is a Remington SPS Varmint.

If the bolt is likely to perforate my eye socket, then to heck with it. If there is some gas blow back around the bolt, then it may be worth the experiment.

Any thoughts?
Colorado Redneck is offline  
Old May 10, 2013, 07:58 PM   #2
Brian Pfleuger
Moderator Emeritus
 
Join Date: June 25, 2008
Location: Austin, CO
Posts: 19,578
CCI small pistol magnum primers are identical to CCI small rifle primers in every way. This does not necessarily apply to other brands.
__________________
Nobody plans to screw up their lives...
...they just don't plan not to.
-Andy Stanley
Brian Pfleuger is offline  
Old May 10, 2013, 07:58 PM   #3
jepp2
Senior Member
 
Join Date: December 24, 2008
Location: Loveland, CO
Posts: 1,476
First, I ass-u-me you always wear eye protection when firing your rifles.

A pierced primer can do damage to the bolt face. The jetting effect will remove metal where the gas stream impacts. It can also damage the tip of the firing pin. The amount of gas getting back to your face would be minimal. Much less than from a case failure on new 22-250 brass I had recently. I will show a picture of that at the bottom of this post.

The blown primer will be the result of overpressure and less likely to happen if you stay within listed loads. But again, not so much of a pressure release.

Either are much less significant than a complete case head separation due to thinning of the case above the head. Those can do serious damage to your rifle. But enough damage to the bolt face isn't something that you want.

jepp2 is offline  
Old May 10, 2013, 08:00 PM   #4
Colorado Redneck
Senior Member
 
Join Date: January 6, 2008
Location: Northeast Colorado
Posts: 1,993
Thx Peetzakiller

I have fairly good faith in that being the case. There certianly was no problem with the 222 Rem load I tried (except the groups looked bad.) Have you ever experienced a pierced rifle primer?
Colorado Redneck is offline  
Old May 10, 2013, 08:06 PM   #5
Brian Pfleuger
Moderator Emeritus
 
Join Date: June 25, 2008
Location: Austin, CO
Posts: 19,578
I've had pierced primers in my Glock 357sig. I didn't know it happened until I inspected the case.

Pierced primers are really not a big deal from a safety standpoint. You'd get bolt face cutting eventually but a couple isn't going to hurt anything, except maybe a tiny spec in the bolt face. Somewhat depending on how bad they pierce, I suppose.

I've been considering trying REGULAR CCI small pistol primers in my .204. They handle HOT 357sig loads just fine, pushing 50,000psi.
__________________
Nobody plans to screw up their lives...
...they just don't plan not to.
-Andy Stanley
Brian Pfleuger is offline  
Old May 10, 2013, 08:06 PM   #6
Jerry45
Senior Member
 
Join Date: April 18, 2000
Location: Metairie, Louisiana
Posts: 890
I had some "bad" primers pierce in my Remington 30-06. They pitted the bolt face but other than that no harm to the human. Still PO'ed about the bolt though. They weren't CCI.
__________________
Guns are not dangerous! People are! RKBA!
Jerry45 is offline  
Old May 10, 2013, 08:23 PM   #7
zplinker
Senior Member
 
Join Date: February 21, 2011
Location: way out here
Posts: 262
With pierced primers, where does that little piece of metal go??? Disassemble you bolt, and you are likely to find it. Not something you want 'floating around' in there.
zplinker is offline  
Old May 10, 2013, 08:42 PM   #8
Jerry45
Senior Member
 
Join Date: April 18, 2000
Location: Metairie, Louisiana
Posts: 890
Bolt has been dissembled and cleaned. There were no little pieces of metal because the metal was vaporized by the burning gasses.
__________________
Guns are not dangerous! People are! RKBA!
Jerry45 is offline  
Old May 10, 2013, 08:44 PM   #9
Colorado Redneck
Senior Member
 
Join Date: January 6, 2008
Location: Northeast Colorado
Posts: 1,993
Thanks--

Just needed rassurance that Medicare wouldn't be on the hook for surgical removal of steel from my ugly mug.

You bet I wear safety glasses when working up new stuff! And some heavy leather gloves.

I have some old H4895 left over from wife's Grampa (maybe 25 years old---cardboard container) and 250 40 Gr. V-max'es that haven 't worked worth a damn with any other combination. Worked up some loads with that powder starting with min charge and the high end has some promise, but used some Rem primers. Hate to waste Rem 7 1/2 primers to fool around developing something. If I can put these components (old H4895, 40 gr. Vmax, CCI#550) together and make them work decent (3/4 inch groups or better) that would be a deal for me.
Colorado Redneck is offline  
Old May 12, 2013, 04:08 PM   #10
Dan Newberry
Senior Member
 
Join Date: October 3, 2012
Location: Wytheville, VA
Posts: 216
With a primer that's totally blown out, hot gas blasts against the bolt face, and can ruin the ejector spring. Savage rifles have a looser fitting ejector pin, and they are susceptible to this--even in some cases the ejector pin has been found welded into the hole, which require a new bolt head to fix the problem (that's cheaper than the machine work which would otherwise be required).
__________________
www.BANGSTEEL.com
Practical Long Range Rifle Courses...
Optimal Charge Weight handload consulting
Dan Newberry is offline  
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 07:17 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
This site and contents, including all posts, Copyright © 1998-2021 S.W.A.T. Magazine
Copyright Complaints: Please direct DMCA Takedown Notices to the registered agent: thefiringline.com
Page generated in 0.08064 seconds with 10 queries