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Thank ya kindly for takin the time to do the great job you did explaining all that in a way that I can understand & apply to my sabot/bullet choices. I enjoy & appreciate learning all this & in the process bring my ML knowledge & experience up to current rapidly evolving levels. Thanks for all you do in here.A 275gr bullet is very long for the harvester light blue sabot. The petals are not long enough to offer good support. We really need a sabot with petals long enough to go slightly past the transition from bearing surface to ogive for best support and the bullet really does better with 50% or more bearing surface for its length.
Plus none of the 45x40 sabots were really made for bullet over 200gr. PR uses the MMP for his soft lead bullets upto 260gr. Those bullets obturate more in the sabot at ignition. They are not as hard on the sabot. Same kinda thing happens when shooting a cup/core and swap to a solid copper. Even though the cup/core shot fine the same weight solid copper is more temperamental when pushing the performance threshold.