I don't intend to try custom loads for a while until I'm comfortable reloading. I just want to basically mimic middle-of-the-road bulk ammo. I plan to reload .45 auto, 5.56, and .308. With that in mind, is there any one powder that's kind of a jack of all trades? Something that will do just fine in each of these and is popular enough to be in most reloading manuals. Or do I need a dedicated pistol and dedicated rifle powder? Thanks in advance.