I have a PILE of Hornady 6.5cm brass that Im trying to decide what to do with. what I need is 6mm cm brass, which I'll hand load, so here is my question. Is it easier to trade 6.5 brass for 6mm brass, or should I just get whatever equipment I need to resize the brass I already have? Ive never necked-down brass before, so If someone wanted to educate me on that process, it might make the decision clear for me. Thanks!