56g is one less than book in the Nosler manual.
That said, if you grabbed said manual and then lagged as badly with other powders at Nosler book loads, it would indicate your rifle...or maybe it is that particular batch of RL19. Sometimes chronographs get screwy.
As we all know the 280 SAAMI spec pressure are relatively mild. All other things equal, a 3000fps 140g load in the the 280 is a milder pressure load than a 3000fps 130g load in a 270...
