Give and take a little here and there for variations in case capacity, chamber dimensions, and powder lot differences...I think that's what accounts for the charge weight / velocity discrepancies. What I look at is, what pressure is required to drive the bullet to "X" velocity with a given combination of components? I believe (I do NOT say I "know") you're running at a little under 55 kpsi. In a modern bolt gun I would not be afraid to push to even higher pressures (and therefore higher velocity) but only in the quest to find an accuracy sweet spot. You might gain a hundred fps by doing that, but velocity just isn't the right motivation to lean on it any harder IMO.
