Both Hornady, and Nosler to get an idea where I want to be in a given load, and for cross-referancing, as well as bullet B.C., and sectional densities etc. but most real useable and practical loads for the purpose of long range, comes from RIGHT HERE AT L/R/H from the members I trust, and who have proven they know what theyre talking about. To be honest, the internet is a scary place for any loading info. Theres a system of ''checks and balances'' here from real shooters. They arent gonna advise loads to get someone hurt with out being ''called out'' by some other members.
All in all most LRH members who give advise on loads, tend to tone them down a notch, and or advise backing off 10% or so to start with if they give you a ''hot'' load. Id rather get it from here, or Nosler.com than anywhere else on the internet.