Re: Spec 308 Copper based lube.
I am not familiar with your specific product; but I am familiar with lubricants. Seemingly the copper based lube is a version of an "anti seize" compound; in industrial and automotive (ect...ect...) such compounds are used in dozens of different applications and formulas. Variations include nickle, copper, molybdenum and even some odd silicone and rare earth compounds. The properties of the base (generally an oil carrier) are a part of the lubricity and the uses can be to fill voids, stop corrosion or to simply lubricate better than a pure grease/oil.
I see no reason that the copper lube should not work on other guns, personally, I use a high molybdenum content lube intended to prevent seizing of steels in a salt water condition (intended for offshore pipefitting). My .02, and I do not profess to be an engineer.