I'm just re-entering rifle work after an extended hiatus and have found most of my older manuals to be fine for some of the older, more traditional powders, but there's been a hell of a lot new powders introduced in the last few years, and I have no information on them. So it's time for a manual buying spree for me as well I suppose. The internet is an okay source for data, but I have experienced enough service outages for me to concede that the printed manuals are king. My plan is to buy a couple each month for the next 2-3 months, and the first one I'll order will be Sierras, most likely followed by Hornady. There are some important differences between the bullet profiles for the two companies, and since they are the most commonly available bullet brands in my area, these will be first.