I've been tinkering with it, it's not as exhaustive as the book manual but it gives the most current data and even though it said something about a subscription, I got it for free, I tried the hornady but they wanted money for actual data, which is fine, I'm sure pressure testing equipment isn't cheap etc, but the Sierra app is very cool, some data less, some is more, totally fascinated with discrepancies in data over time as powders change and testing equipment and methods improve etc