I’ve a few queries on these tracers and I was wondering if anyone could help. I saw on one of the Italian web sites that the base of the 7.92x57mm tracer projectiles can have two colours, red and yellow. First question, do these colours relate to the trace colour? Second I have a blue/purple base, is this known, or maybe could it be a Polish, Czech variant. The ‘blue’ projectile weighs 10.32g, length 37mm, and has quite a flat or squared off base as can be seen above. Some of my ‘yellow’ based tracers have a 14mm black tip, would this indicate a different colour of trace?