Ok, how is SIG making hybrid ammo?

cyanidekid · Jan 7, 2023

How is SIG or their partners making stainless -brass cartridge cases for the .277 ? From a material strength standpoint it makes sense, but cranking out millions of them.. well seems nuts. Anyone have some Metallurgical how it’s done?

FamilyTradition · Jan 7, 2023

I don't think there's much in terms of metallurgical magic involved with it. If you look at the diagram on this article: https://www.all4shooters.com/en/hun...rid-cartridge-the-cross-in-277-fury-277-fury/

It looks like the brass and steel are stamped and drawn separately, then mechanically fastened together.

plastikdreams · Jan 7, 2023

Says it's a stainless base coupled to a brass body using an aluminum locking ring...

DDoug · Jan 7, 2023

plastikdreams said:
Says it's a stainless base coupled to a brass body using an aluminum locking ring...

Might be using this:

Electromagnetic Forming Technology

Assembly process can be used wherever components need to be joined, assembled, or formed to specific shapes.

elmaginc.com

GGaskill · Jan 7, 2023

I wonder if those cases are reloadable. The aluminum Blazer cases aren't.

jmm03 · Jan 8, 2023

I wonder over time if there will be a dissimilar metals reaction.

cyanidekid · Jan 8, 2023

ahh, ok, so its a full(ish) brass case, with a rebated rim and a reinforcing "back cap". still wonder how the assembly is done, guess the stainless base can be deformed or "closed" around the locking ring. seems it would have springback tho... I'd like to see the presses and dies.

cyanidekid · Jan 8, 2023

GGaskill said:
I wonder if those cases are reloadable. The aluminum Blazer cases aren't.

since it's a full length (or nearly) brass case, I don't see why not. don't know how replaceable the primers would be, but they look like a "cup" type just bigger, so seems likely.

MilGunsmith · Jan 9, 2023

We are testing these daily here at work. The current case design is two piece, they have done away with the locking ring. The brass is swaged onto the stainless steel base. I just sectioned some for a display.

MilGunsmith · 2023-01-18T06:48:10-0600

Here is a picture of the cutaway brass. You can see the two pieces swaged together.

GGaskill · 2023-01-18T19:04:43-0600

I guess that recurve at the very bottom is what prevents case separations.

john.k · 2023-01-18T20:46:56-0600

Funny,but amateur collectors and shooters have been using exactly the same method of joining brass tube to steel bases to make obsolete cases since I was a child.........The system was invnted and patented by Col. Edward M Boxer RE in 1864,in relation to the conversion of muzzle loading rifles to Sniders patent system of breech loading.

cyanidekid · 2023-01-18T21:44:58-0600

ok, that makes a whole lot more sense than aluminum locking rings. are those standard large rifle primers or proprietary?

john.k · 2023-01-18T21:52:42-0600

people have been making rifle cases from drawn steel for over 80 years ......in fact much european military ammo is all ferrous ...no brass at all,not even primers...........so how does this process have any cost advantage over steel cases?

GGaskill · 2023-01-19T00:21:36-0600

Plain steel cases wouldn't cost much. Composite ones will cost lots more, hence, more income for the producer. : - )

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Ok, how is SIG making hybrid ammo?

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