I say the Lyman No. 48 Reloading Handbook would be a good one to pick up. Lyman data always contains data for cast bullets. The Lyman Cast Bullet Handbook is an essential resource if you ever begin casting and reloading.
For jacketed bullets in rifles, the Sierra manual is a favorite. I'd get the one on CD because the printed manual is massive.
I rely mostly on handbooks made by bullet makers. I also use the data offered in pamphlets and online by powder manufacturers such as Hodgdon, Alliant, Winchester, Accurate and Winchester. I try to look at several sources before working on a new combination.