Now there's a funny coincidence..
My neighbour just dropped off some old live ammo to me and after pulling the bullets it turns out they were 6,5x52 Carcanos with a copy of cordite named Solenite inside which was still in good condition, the out sides were all green corrosion and the bullets had begun to rust as they were steel jackets but copper washed.

The heat over here in Bavaria is very high at the moment 37C/98F.