Buddy of mine has or had a Remington M700 factory chambered in .300 WTBY mag. He told me it put 200gr. Noslers out using Speer data for IMR7828, at just over 3,200fps. I said B-ll-Sh--, in my usually soft manner.
Well, I did get to chronograph it, little finger bolt lift and 3,230fps or so - 200gr. Nosler Partition. It was almost 200fps faster than the book. Who'd have thought?
The data was out of #8 or #9 Speer Manual I think & that load or data in not in the current books.

If I remember correctly, it was 82.0gr. IMR7828 with Fed. 215 primer.