I bought the Snosler book as well, VERY unimpressed... pg.155 W760&H414. Either that is not current info, or there is ONE HELL of a lot variation that I've never seen in 10 years with that powder....

For folks that I believe ACTUALLY do pressure testing with current lots, Sierra & Lyman!!
Speer's books are also fairly close to reality, and they do final velocities in REAL guns, NOT pressure barrels.

Pick what makes you happy, and enjoy