All of the bullet and powder manufacturers have load data for their products, and I trust it almost exclusively, as they test their load data constantly. Hodgdon's powders, who also own the IMR brand, Alliant, and one that I've gone to more than some of the old standbys, Ramshot, all have online load data. Ramshot is constantly publishing new data, adding more calibers, and meters well and burns so cleanly that it's hard to use anything else. Hornady has some good data and components too, and for a while it was the only place to look for .450 Bushmaster data. As for Forums, this is the one that fills the bill for my hunting and shooting efforts, and I'm not enough of a computer nut to spend time looking elsewhere, so I'm no authority there...
