What are these markings?

[Kevatc]

Found a handful of .308 brass (and one round) all with these markings on the case. All had the same headstamp. Anybody fill me in on what I am looking at?

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[coop44]

a fluted chamber as what is used in HK rifles, probably others, Aids in extraction as powder fouling generally falls between the flutes. A thoughtful combat option.

 

[halmbarte]

HK type rifle.

The flutes float the brass so it doesn't stick to the chamber. Needed as the roller delayed blowback system that rifle uses starts unlocking while the chamber pressure is very high. W/o the flutes the extractor would rip the head off the case.

H

 

[gnarl]

Very strange...like someone tried to fire a .308 in an 30-06?

 

[RockKrawler]

Here is decent discussion on what makes use a fluted chamber,has a pic where the brass looks like the ones you found as well.
308 fluted chamber? - GunRightsMedia

 

[Abiqua]

That's what brass from my HK91 looks like. Throws it a good 30+ feet.

 

[Kevatc]

HK type rifle.

The flutes float the brass so it doesn't stick to the chamber. Needed as the roller delayed blowback system that rifle uses starts unlocking while the chamber pressure is very high. W/o the flutes the extractor would rip the head off the case.

H

So, no way this could be a bolt gun kind of thing?

 

[halmbarte]

So, no way this could be a bolt gun kind of thing?

Nope. Not unless some pinhead with more time and money than good sense got aholdt of a G3 barrel and welded a bolt action onto the end of it.

No reason to do this with a bolt action. On a bolt gun, or any other rifle that actually locks the bolt to the barrel, you let pressures drop so that the brass isn't ripped in half during primary extraction. Delayed blowback weapons start extracting while the brass is still pressurized and require flutes, greased, waxed, or lubricated ammo to handle the forces.

H

 

[Kevatc]

Nope. Not unless some pinhead with more time and money than good sense got aholdt of a G3 barrel and welded a bolt action onto the end of it.

No reason to do this with a bolt action. On a bolt gun, or any other rifle that actually locks the bolt to the barrel, you let pressures drop so that the brass isn't ripped in half during primary extraction. Delayed blowback weapons start extracting while the brass is still pressurized and require flutes, greased, waxed, or lubricated ammo to handle the forces.

H

Thanks! Learn something new everyday! One more question .... lubed ammo. Never heard of that. Is that a thing unique to HK type guns? Is it a practical type military idea or is it more of a civilian thing? Sorry, more than one question there.

 

[Spadkarma]

That's why some people refer to G3s and clones as "Brass Rapers".

 

[moose]

Looks like to me, it makes for a very dirty chamber.

 

[Redcap]

Very strange...like someone tried to fire a .308 in an 30-06?

Nope. Definitely a HK rifle.

 

[civilian75]

That's why some people refer to G3s and clones as "Brass Rapers".

+1 HK/CETME/SMG. Cases where fired by a delayed blowback rifle with flutted chambers. I once tried to re-size a 7.62Nato LC range pick-up case, just out of curiosity. I had just stater reloading. It was, as the Japanese say, "very difficult".

 

[halmbarte]

Thanks! Learn something new everyday! One more question .... lubed ammo. Never heard of that. Is that a thing unique to HK type guns? Is it a practical type military idea or is it more of a civilian thing? Sorry, more than one question there.

HKs don't require lubed ammo as the chambers are fluted. Some other weapons used ammo that has waxed cases or even little oil pumps to spray oil on the ammo or in the chamber. One of the Jap MGs from WWII had a little oil reservoir with a brush that applied oil to the incoming rounds.

Generally speaking, requiring ammo to be lubed is a good sign the designing engineer isn't as clever as he thinks he is.

H