They make good bathroom reading, too. Hornady's 5th and Lee's books have a lot of material on the "why" of things, with lots of interesting anecdotes ...... good stuff to know and food for thought.
Lots of long answers. Try this - put a factory 150 in your shell holder and screw down the seating die until it contacts the bullet. Lock the die and you're ready. 4064 is my favorite powder for 150s. Some of the old manuals show 53gr as Max, but newer manuals show less. In four rifles over the years, I used 52 for 2950 and 30fps Extreme Spread. Showed no pressure and shot 3/4" all day long.
