I seem to go to my Sierra books more than the others. The external ballistics tables are very useful. I have Hornady & Speer books, as well as an old Lyman lead-bullet book and a slew of modern pamphlet-type data.
About OAL: In my rifle reloads, I first seat the bullet and see if it "grabs" on the lands. If not, I check to see if it fits in the magazine. Whatever length which fits the magazine, and almost touches the lands is "just right" for me. I don't think I've ever measured the OAL of a rifle cartridge.