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The manual is valuable because it INSTRUCTS. It says what to do and why. That doesn't change much.
Current powder data is free from the manufacturers.
If you want recipes specific to a particular brand of bullet, not used or not identified by the powder company without having to "work up" from generic or other brand data, you should buy the current edition.
We are frequently told that powder specifications and even sources change over time. But if I were going to make a really significant change in my product, I would give it a new name. So wouldn't the powder company?
It used to seem strange that all these revised specs lead to lighter powder charges, but Slamfire finally gave a credible explanation.
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