@Tahr I think you are talking about the Norma plastic point projectiles:
Norma Plastic Point - Norma
They were still silver in the early 90's (copper-nickel) but seem to have changed to gilding metal.
We killed lots of things with them out of SLRs and my mates 30-06. They expanded quite fast in comparison with the common lead tip projectiles and tended to rip big holes in goats.
I think I still have a silver one somewhere.
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