I just had some new Lapua brass delivered in .223 and 6.5x55. All lovely and new and clean and shiny! However on closer inspection the colour of the brass on the neck area is different to the colour on the rest of the case. This is the same on all of the cases. Is this normal as an artefact of the manufacturing process for new brass? I have always used once fired cases from factory ammo in the past and never seen this. All thoughts and comments gratefully received. Cheers.