.308 brass - strange shoulder after firing

[rd_zzyzx]

I was on another forum and someone posted this picture of .308 brass after firing in his semi-auto rifle.

Another guy on the forum says it is normal, and yet another guy posted and says his rifle does it to and when he tried to reload the brass with a full length resizing die it doesn't correct the change in the shoulder and the round will not chamber in his bolt action rifle.

Is this normal? What would you do if your new rifle was spitting out brass shaped like this?

 

[jwrowland77]

I would say no. None of my brass looks like that. It almost appears like some got a little overzealous with the outside neck turner.

 

[243winxb]

Auto loader? The action may open before the brass is done expanding. Necks are annealed. This makes the neck/shoulder area softer then the body.

 

[sirgilligan]

Yes, it is a semi-automatic rifle. I saw it on the FN forum.

p.s. One of the main contributors on the forum says that it is normal.

 

[rd_zzyzx]

It is an FN SCAR 17.

 

[newfalguy101]

I don't see an issue with it

 

[rd_zzyzx]

I don't see an issue with it

I don't know enough to say if there is a problem. But it does create questions.

Where is the shoulder supposed to start?
Is there a standard that a chamber should be cut to? If so, is this chamber cut to the standard?

Maybe this is a lot of hoodoo about nothing, but the one guy saying they won't chamber in his other .308 indicates that either something is wrong with the case, something is wrong with his resizing die, or something is wrong with his other .308. Too many variables I guess we will never know.

But it sure does look odd.

 

[Paddy]

Is this new ammo or reloads?

 

[rd_zzyzx]

Is this new ammo or reloads?

From my understanding it is new ammo.

About two years ago someone else posted this:

The brass on the left was fired out of a bolt gun, the right out of a SCAR 17.

The cases have to be forming to the chamber and there has to be some extra angle in the chamber, I mean look at how crisp the lines are.

 

[rcmodel]

Not the first time.

http://www.ar15.com/archive/topic.html?b=6&f=24&t=381118

But I can't imagine why they would cut a chamber that way??

It would be worth a call the FNH to ask them though!

rc

 

[Paddy]

My 308 brass looks like that after it's been through my hollywood sizing die. The neck is not sized down all the way it seems. If that's what we are looking at that is.

 

[243winxb]

HK P30 Stepped chamber

[/URL][/IMG] Stepped chamber perfectly normal for this pistol. http://www.thehighroad.org/showthread.php?t=658115 Seems like HK likes to do things different.

 

[rd_zzyzx]

Seems that a conclusion to this is that FN SCAR 17 chambers are made such that the "ring" or "extra shoulder" is normal. I found some old posts showing this from two years ago.

So, if you have a SCAR 17, and you notice your brass is like the photos above, others have seen the same thing and it is not considered a defect.