While there is good information on the net, it is not possible to look at the data from multiple sources at once. I suggest you get as many manuals as possible. Often there appears to be conflicting information, but one source might list load data in velocity increments of 100 fps, while another might list loads in incremental powder charges to the nearest full gr - the two are not going to be the same. Another source might list loads based on incremental pressure, listing only a starting and maximum suggested load. At least one source lists charges by volume rather than weight. Some sources list a "best accuracy" load. Some give powder density. Some sources do not list all the powders that are suitable for a given bullet weight and some sources have special sections for gas guns. Some times the load data is just wrong. The current Hornady data for .375 Ultra is out by - well, alot, but I do not recall ever seeing published data that was dangerous, provided safe loading practices were followed. In order to fully understand what the safe loading practices are, you need manuals.