I currently work out of the Speer #14, Sierra #2, Winchester's, Hogdon's, Hornady's and whatever else I have available. The single caliber load books are a great reference and includes data from the domestic bullet and powder vendors. The section on Sierra's data also gives a recomended accuracy and hunting load. A good starting point would be the Lyman 47'th edition, this manual gives factory spec load data for the majority of the popular commercial cartridges. As far as powders go there is no one do it all powder for a number of guns, but for what you'll be loading for H380 may be a good place to start without having to by powder for each rifle cartridge. For the 357, it is said that there is no finer powder than w296 for magnum cartridges, 231, blue dot and unique also do well for the 38/357. For the most part you can use data from any of the manufacturers for the comparible bullet weight but you'll have to see what works best in your guns. I personally like Hornady and Sierra bullets for accuracy and performance, they're a lot cheaper than the Noslers, Barnes, etc. Either way your in the right place to ask.