I have a 6mm-284 and right now and I am using Winchester brass. I have been having some trouble with this brass from lot to lot with differences in velocity and pressure. I have been using the same bullets and Powder. Now my question is I see Lapua makes 6.5-284 brass and I should be able to neck that down no problem. How good is Lapua brass and is it harder then Winchester brass? Will it last longer?