How bullet companies make a load book:
Low pressure, short OAL, and low velocity.
How powder companies make a load book:
Low pressure, short OAL, imaginary high velocities.
How to read load books: Bullet company books, throw them out. Powder company books, change the OAL and increase powder proprotional to change in powder space, also increase powder percentage proportional to another 1/2 of possible pressure increase percentage.