Every rifles max pressure is different and reload manuals are now written by lawyers,so grain of salt.

When I buy a new rifle I ladder test increasing powder load by 0.3 grain til I establish max pressure in my rifle. This serves 2 purposes. Establishing max pressure with real world data and establishing the node.
Then I work within the node to find the most consistent powder load.
A reloading manual uses their test mule which isn't the same as your rifle,so they are more of a guide then set in stone.
Just my opinion.