I haven’t been following this thread, but I am surprised that the bullet is magnetic. I visited Lake City when they were at full rate production on these rounds. They were still producing the cases from 7.62 NATO cups so there was a lot of trim from the case manufacture. They were expecting to receive cups specifically for the 39mm case within a short time.
I spoke with they lead engineer for the project. He said that the Lake City cases and bullets were designed based on the Finnish 7.62x39mm case and bullet. All Lake City production used a GM bullet jacket (non-magnetic) lead core bullet. He told me that they had made a test batch of bullets with GM coated steel jackets but had dropped that idea early on and no production of steel jackets loads ever took place. In fact, I don’t think the bullets were ever loaded and test fired. He gave me one of the steel jacket bullets which I passed on to the Woodin Laboratory.
I was under the impression that Lake City never produced any steel jacketed 7.62x39mm ammunition. They did give me a chrome plated round. At that time 50 had been made for a group of senior visitors. The head of the government group at LC had 7 or 8 left and gave me one. The people at LC were very upfront that the ball ammunition was being made for Cambodia.
LC was also producing 7.62x39mm blank rounds. They had been producing these for some time, well before any work on the ball cartridges. The blanks were for a tactics training school at Ft Hood as I remember, but in Texas.
Back then I was a USAF Captain and made a blind call to the Defense Contract Management Office and asked if I could come over and visit (this was late 1970 or sometime in 1971). To my surprise they were glad to have me come over and the head of the government contract management group spent the whole day with me, and I left with a bag full of goodies. The good old days.
The guy who hosted me told me an interesting story. This was during the troubles in Northern Ireland. Boxes of LC 5.56mm was showing up on the streets of Belfast from production lots that had not yet been issued to US troops. In fact it was showning up while still in transportation. Initially they thought that the ammo was being stolen during shipment, but couldn’t find any indication of this. It turned out that there were a couple of guys at LC on the production line that would run off a few extra cases of ammo, put them in the trunks of their cars and drive out the gate with them. The guy they were selling them to was shipping them straight to Northern Ireland. It was not clear, to me, whether the guys stealing the ammo knew it was going to the IRA.
Bottom line is I don’t think either of your two rounds was either LC or FA production-though I am sure no expert in this area. The boxes Fede shows in his post don’t look anything like the boxes used for the Lake City rounds. I think I still have one of those boxes-flat and never used-from my Lake City buried in my storeroom.
It would be very clever for somebody who was sending ammo to places it shouldn’t be to make it look like the LC production. Might be interesting to compare the powder from these rounds with the powder from a legit LC round.