I totally believe the 6.5 is able to achieve .4MoA All the way to 500 yards. But with the massive amounts of powder in the RUM, I see upwards of 70fps velocity spreads. And at 500 yards, my groups can look like a oval due to this even though I can achieve .5MOA at 100yards. But this is with FL sized cartridges. I believe if I took my neck turned new cases (necks at .0014"), and fireformed them (which I am in the process of a batch of 100), then neck sized them and loaded and picked thru for concentricity, I could definately lower that 70fps spread to 30fps. On a 308 load I have, I can get 15fps spreads pretty easy. But havn't found a real consistent low spread RUM powder yet. I have been using H1000, RL22, RL25, and retumbo.