Looking for some help to I.D. cartridge case

[RCS]

I have had this cartridge case for a long time and believe it might be a proprietary cartridge for Guns & Ammo magazine. the headstamp is NORMA G&A SPECIAL.

length 2.86 inches rim diameter .540 inch outside dia at case mouth .525 inch and inside diameter at case mouth .500

Either it was developed for a special Guns&Ammo rifle or just a case manufactured to be used in forming other calibers. Note it is without a belt but could be formed for some
of the old Newton cartridges. If G&A used a rifle I would think that it would be a Mauser type. Photo shows the G&A case next to the 7,62x51mm NATO cartridge.

I am unable to find out anything and any help would be appreciated, RCSAttachment 89637Attachment 89638Attachment 89639

Information

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