What brand cases are you using, case capacity has a great deal to do with chamber pressure.
If the cases you are using have more capacity than the Nosler cases used in the Nosler manual your pressures will be lower.
So what brand cases are you using and how many grains of H2O do they hold.
Try Retumbo. I'm hitting 3100 with a 168gr in mine.
"--------- When you get close to the upper limits, fps can start to drop with increased powder charges........"
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