Alf, could you please tell me how far into the lands (or out) your load is, and where you start load development at in relation to the lands?
Generally I always start .015"-.020" in the lands, leaving only one direction to go testing seating depths. I don't care if it fits in the magazine or not, I'm after best accuracy first.
130 Berger VLD seated about this much in the lands at 2.735" to start load work: