Powder distributors release new load data every year. You can get it directly from the main distributor's website. It is in the form of a magazine, because it is little more than a list of recipes. Western Powders has one and Hodgdon has one. Western Powders even has separate guides for at least some of their brands, like Ramshot. There is a guide just for Ramshot powders that usually ships free when you make a bulk purchase of a Ramshot powder.
These are all cheap, with Hodgdons being the most expensive at about $13. The Western Powders guide is $3.
These are all cheap, with Hodgdons being the most expensive at about $13. The Western Powders guide is $3.