No you didn’t screw up!
That’s an excellent powder that’s real close to the preferred H4350.
Hodgdons has taken over marketing and distribution of Accurate and Western Powders.
Hodgdons has online data for Acc4350.
Starting with a Hornady 150 Spt is 63.5. Max is 70.0.
Acc4350 is about as good as it gets with a 150 in a .300WSM.
In my neck of the woods, that’s a very popular combo (.300wsm and 150gr bullet).
The Nosler Partition and Accubond are popular. To 300yds, shoots really flat @nd expands well on our smallish deer.