.50BMG problem

[uvson]

For my friend, I post this particular problem.
I've knowledge about small calibers like 308, but here, I'm out!

On sunday we shooted about 160 rounds during all the day with a .50'rifle. Temperature was about 25°C.

This reload had used many times without defect

Big surprise at home during the bolt cleaning to look at these holes.
he discovered three craters?

No opening bolt problem during shooting. Only three defects out of 160.

Any comments or suggestions?
many thanks

Julien

 

[JRose]

Re: .50BMG problem

My only comments are "You shot 160 rounds of .50 in one day!!!!:

 

[Pirate-69]

Re: .50BMG problem

How many times have these cases been reloaded? It looks like the primer pocket may have become enlarged and leakage around the primer occurred. Hard to tell, by the picture, if there is primer cratering or not. Looks like there may be a swape on the rim. What ever happened, it was hot enough to burn the bolt. Just guessing.

 

[Suasponte]

Re: .50BMG problem

CCI had some problems with primers some time back! There where guys having said problems with the primers as you show! CCI took returns and shipped replacement primers for certain lot numbers!

I am no longer a member of the FCSA (Fifty Caliber Shootes Assoc.) FCSA Web page . but there may be lot numbers and some better info about this there!

Check on this web page or contact CCI CCI Contact info .

They replaced 2k of primers I had.

There was several guys that had damage to high end match rifles with the CCI primers! This looks just like that problem!

IF those reloads are CCI #35 primers call CCI and give them the lot numbers and I bet they will replace them. Also, send them the picture of your damaged bolt face and I bet they pay for that too!

Terry

 

[The Mechanic]

Re: .50BMG problem

That is a VERY generous chamfer on that primer pocket. I am thinking maybe to much primer pocket work. An overly light load can cause this to happen also. First things first if you loaded this ammo, did it take some effort to get those primer in? Usually you will flatten the primer a bit, in fact RWS primers require some flattening to "arm" them. Last if the shoulder is pushed to far and primers not good and tight they can pop out a bit. You can get a case gauge from George on Biggerhammer. Here is a pic of a good trim.
http://www.biggerhammer.net/barrett/wwwboard/index.cgi?read=214850
pic of a case gauge.
http://www.biggerhammer.net/barrett/wwwboard/index.cgi?read=211397

 

[The Mechanic]

Re: .50BMG problem

I am still a member of FCSA so if you have the lot number I can check for you.

 

[uvson]

Re: .50BMG problem

Yes 160 rounds for a day during a challenge.
see http://picasaweb.google.fr/uvson308/CisseMai200902#
and http://www.youtube.com/user/uvsonmidrange

These cases have been reload a two time.

Yes, he use CCI primer, I'll forward the lot number

Thanks your for answer

 

[uvson]

Re: .50BMG problem

All primer holes have been refurbishment with a Sinclair tool just before this reloading....

lot number used are
-E23A
-A31A

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: The Mechanic</div><div class="ubbcode-body">That is a VERY generous chamfer on that primer pocket. I am thinking maybe to much primer pocket work. An overly light load can cause this to happen also. First things first if you loaded this ammo, did it take some effort to get those primer in? Usually you will flatten the primer a bit, in fact RWS primers require some flattening to "arm" them. Last if the shoulder is pushed to far and primers not good and tight they can pop out a bit. You can get a case gauge from George on Biggerhammer. Here is a pic of a good trim.
http://www.biggerhammer.net/barrett/wwwboard/index.cgi?read=214850
pic of a case gauge.
http://www.biggerhammer.net/barrett/wwwboard/index.cgi?read=211397 </div></div>

 

[The Mechanic]

Re: .50BMG problem

what kind of primer depth do you have on some of (if you still have any) your loaded rounds? Did they require normal pressure seating them?

 

[uvson]

Re: .50BMG problem

About primer, absolutly everything is normal.
No problem during seating.

About depth, I don't understand the question.
You want to know if the primer is at the bottom of the primer location?

 

[The Mechanic]

Re: .50BMG problem

You should have between .002 and .004 below the case head. To shallow and you get a slam fire with semi (not your problem) but will also set the case forward a bit in the chamber. To low and you can get soft hits (dangerous) and a primer that will slide back on ignition.

 

[uvson]

Re: .50BMG problem

ok, I understand. It's ok on them

 

[Suasponte]

Re: .50BMG problem

I believe from memory that the E23A lot number was one of the lot numbers recalled! I have a call into a friend that keeps all that info.. He too had some replaced!

Call CCI and follow up!

Terry

The Mechanic:

Search the FCSA board for CCI #35 Recall! I think that it was back in 2005-6.

 

[The Mechanic]

Re: .50BMG problem

I will do the search when I get home tonight

 

[Suasponte]

Re: .50BMG problem

My buddy just called me with a list of known bad lot #'s.

He has six of them. CO6J, E13J, J29E, K16B, C12E, & C12J.

Just because yours is not one of the listed ones that was known to be bad does not mean that you do not have bad primers! This is the exact same issue that many FSCA shooters was having! So many people complained of damage to bolt faces just like you show they had to do something! Send the lots numbers and photos of the damage to CCI and I bet you will get new primers mailed to you and a check to fix or replace your bolt!

Terry

 

[The Mechanic]

Re: .50BMG problem

On the FCSA site for this problem it seemed to most that ALL of the "E" lot was suspect. The E23A's would be the suspect primers If you want to still consider them I would permanent marker the case of the ones with the "E" primers that way if any more come back pierced than you will know for sure that these are bad. I would imagine CCI would replace them now that production is starting to "catch up" with demand.

 

[uvson]

Re: .50BMG problem

Thank you for these informations. I will contact my supplier and CCI about this problem.

Many thanks again!!