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OOOOOOOOOOORRRRRRRRR...you've changed your PRESSURE CURVE, by increasing your powder charge just enough to overcome the inertia of moving the bullet just enough to make room for the burning gases to expand more quickley...UNTIL the bullet takes the rifling, then slowing down, allowing the pressure to build once again. Chamber pressure effects velocity, but not necessarily proportionately. If you don't feel that your load should be maxed out, if none of the signs of excessive pressure are present...sticky bolt, bulged brass, enlarged primer pocket, cratered primer etc...then it may not be maximum. I would still research for loading data, and back off on the charge until the cause of this deviation is determined.
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