Drop tables are a notoriously imprecise way to determine velocity. 100 fps just makes 1/3 moa difference at 200 yards for your bullet in that velocity range, but just 50 fps makes a significant difference in pressure when you're near maximum. You'd need to fire some large shot count groups to get averages accurate enough to be sure what you are seeing is real and not an artifact of randomness.
I don't recall if you said what length the new barrel is?
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