Have you got a copy of Senich's 'The German Assault Rifle 1935-1945'?
According to this ( p.177 ) :-
'Bullets were normally ''Tombak plated''; Cupronickel saw limited use as well. Referenced bt the Germans as Tombak Plattiertem Stahlmantel ( Tombak Plated Steel Jacket ) an alloy of copper and steel....'
Also ( p.182 ) :-
'Although blue, black, green and red primer annulus colors will be noted on Kurz cartridges, the various colors were apparently used without any particular significance. Later standardized, a Polte blueprint gives October 1944 as general adoption of the blue primer annulus, the most common of those mentioned'.
Don't know if any of this helps you....
[ 03. November 2002, 01:37 PM: Message edited by: Martin Bull ]