[Rommerdale]

What do y'all know about this? I inherited a few hundred 308's and just finished depriming and sizing them. Some of them looked like this. I'm just wondering if it happened when they were fired or were they made like that.

 

[Subsonix]

They were fired from guns with fluted chambers.

Maybe HK or FN rifles.

 

[live2hunt]

So what would be the purpose or benefits of a fluted chamber ?

 

[GunnyGene]

They were fired from guns with fluted chambers.

I didn't even know there was such a thing. What would be the purpose of it?

 

[bubbat]

Some H&K rifles have fluted chambers.

 

[bubbat]

I didn't even know there was such a thing. What would be the purpose of it?

A Fluted chamber is a chamber that permits the leaking of gas around the cartridge during the removal. Fluted chambers are often seen in Delayed Blowback firearms.

 

[Myers]

The fluted chamber theoretically aids in extraction, it’s a pretty tell tale sign it was fired through probably an HK91.

 

[Rommerdale]

Are they still good to go in bolt actions? They seemed to size fine, just like the others.

 

[Subsonix]

Even if the sizer doesn't completely remove the grooves, the brass will fire-form to your chamber when you shoot.

 

[L Smith]

Roller delayed blowback rifles do not twist the case during extraction. This could cause failed extraction and or case rim to be ripped off. The flutes allow gas to push the case as well as have less surface area for the case to drag against.
The marks on the case generally don’t cause any problems but those type of rifles can dent the case neck and shoulder beyond repair at times.

 

[HerrZnk]

Definitely fired in an HK 91 (or G3). This from a recovering HK collector. 91,93, MPi5, P7. Played with a few 21s too in Germany.

 

[SubGunFan]

And you might even find some 9mm cases with the same lines.

.

 

[colonelz]

And you might even find some 9mm cases with the same lines.

The H&K P7 squeeze cock pistol does the same thing - delayed blowback.

 

[Rommerdale]

This is why I love you guys. I learn every time I ask questions. Thank you!

 

[Subsonix]

And you might even find some 9mm cases with the same lines.

.

Or even some .22lr cases. Glock and Sig use fluted chambers on their rimfires.

 

[John Harvey]

My SVT-40 does this with 54R also

 

[Ceb11]

The fluted chamber theoretically aids in extraction, it’s a pretty tell tale sign it was fired through probably an HK91.

Absolutely a 91

 

[Joe S.]

POF uses a similar system although I don’t think it is that fluted.