For printed manuals I'm a big fan of Lyman's manual, the reason is because they give you data for a variety of powders and projectiles.....not just the brand that they sell. It's tough to justify buying a manual for every brand bullet out there.
I also purchased Quickload loading software, it works quite well...they do have a warning about always confirming the info they give you with a manual....I do this to make sure it's ballpark correct, in case there's a programming error but so far everything has been spot on. I like being able to tweak the charge on my software and see approx. the velocity/pressure changes that's going to cause. The software is very accurate. It's also easy to develop a new load when switching bullets, once you find your guns sweet spot you can see what it will take to get that same velocity with different bullets very quickly. It's had a huge impact on my load development.
