If you're going to load a specific cartrdige - I forget what they are called, but for like less than 10 bucks, someone sells just the pages from major reloading manuals for individual cartrdiges, all together in a booklet. As a new reloader, what I both found frustrating and liked, cause I learned a lot - was the load data, to me - seemed to have anomolies that did not make sense. I just didn't know enough, even though I'd read a half dozen or so reloading manuals and books. Finally figuring out how some of the puzzle pieces actually work, those odd things in the load data make perfect sense. So does the advice to always work your load up and watch for signs of pressure. If you're not using the exact components in the load data, bullet shape varies, and so will the size of the space in the case where the powder goes. Any change in that space/volume, from the exact load data you're looking at, changes the behavior and the pressure. food for thought