Well, my first batch with the wet tumble looks great! I did notice that there is a design difference in the 38 spl cases from Federal vs Winchester. It seems that on the inside primer flash hole the Federal brass seems to have a 2mm circle or rivet in the brass. Whereas the Winchester brass is just flat at the base inside. Any reason to worry or not mix these when processing for reloading. Would they require different brand/type primers? Or, just standard small pistol primers. The outside primer and pockets look identical.