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Gilding metal is a type of jacket material, not a jacket construction alone. Most, but not all, USGI LC80 is thin steel jacket covered with a gilding metal jacket, its what you are calling bi metal, some people call it gilding metal jacket, which is misleading to its construction. ( Bi-Metal is a term that seems to come about from Wolf ammo and 7.62 russian surplus, [not the same as the old coperwashed steel jacket chinese ammo. it was very thickly jacketed with mild steel.] )
Many of the popular surplus NATO spec 7.62x51 ammo is con
structed this way. Vey few are not. Its not bad for the rifle. Steel core has shown to increase wear to a degree. Just because a magnet sticks to a bullet doesent mean its steel core either, a steel jacket with a gilding metal jacket will attract a magnet as well. Something to check. Its a very low attraction so use a good magnet.
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Speaking only of the jacket construction.
Gilding metal is a copper alloy, a brass, comprising 95% copper and 5% zinc. No steel in jacket.
Bi metal is a thin layer of copper over a thin layer of mild steel.
Again only concerned with jacket construction, which makes contact with the rifling.
Not opposed totally to the surplus Greek ammo but this along with its age combined with how it has been stored ( as evidenced by reported condition of packaging and reports of corrosion on the ammo itself) makes me think there are better options for a bit more money.
For only slightly more, the ZQI from Wal Mart is surefire new production. The reports of poor accuracy mentioned before from what I read on The FAL files were mostly from FALs , which in general are not exactly known for top notch accuracy. Testing with other types and bolt guns provided much better results. Acquiring large amounts is the problem with the ZQI ammo as was mentioned earlier.
PPU is 10 cents/ rd. more for someone needing to stock up and has a good rep.
ETA I would probably consider Wolf at under $9 a box if looking at the Greek surplus.
Personally I prefer newer production as I still have quite a bit of decades old boxed S.A , boxed Port and then 3k linked 1993 production Port & other misc types to burn through before getting to anything purchased now.
JMO