I use Loadbooks USA as a source for the calibers I load. They contain good load information from many sources for all bullet types. The powder companies are excellent sources for cast bullet loads for calibers that are typically loaded with cast bullets. The Lyman Cast Bullet manual is the "bible" for load data and has more load data than anything else for calibers that are typically not loaded with cast bullets (like 30-06.) The problem is that the velocity figures are based on velocities from test barrels, not firearms, so they are very different that you can realistically expect in your firearms.