Yeah... the fact that it's a stigma here is unfortunate. You and I both use copper monos, so I think that changes the game for us with respect to getting all of the benefits from the 6.5 cartridges. From what I've read, need cartridges that start fast and stay fast, guaranteeing the best possible expansion. The great thing about monos is the penetration, even with lighter bullets. Form has me looking really hard at the 6mm CM, and I just read about the 6mm ARC today, which I had no idea even existed. The 6CM starts fast and holds it's velocity really well up to about 450 yards.