Phil Sharpe's was the best; it's obsolete.
Earl Naramore had a great one in Principles and Practice... and Townsend Whelan's Why Not Load Your Own was the best introduction in its day. There is no single best manual available today and Pet Loads is obsolete too. Bob Hagel's Game Loads and Practical Ballistics... was better in its day than anything newer but it too is obsolete. The subsequent reprint by Wolfe and Wolfe's collection of Hagel's writing in their journals shouldn't be missed.
In particular the use of a chronograph in estimating pressure is not well enough covered in modern manuals and there is too much hangover from the days of measuring case expansion and judging pressure by looking at the primer and the case head.
For load information the powder vendor's manuals are a good check for pressure tested loads and the manual by the maker of the bullet you choose to use should always be read thoroughly. After that reading everything you can get your hands on is wise.
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