I would buy one hard copy reloading manual for reference...
and then rely on online data ( primarily from the powder mfg's ...like Hodgdon)...they will update the online data if they reformulate a powder or do some additional testing.
I don't see a need to keep current hard copy reloading recipe manuals around...( I've been reloading off and on for over 50 years )...and manuals can be interesting historical reads...but not that useful.../ but what is very useful is the hard copy manuals with your press - I do download new additions to my MEC or Dillon presses, if they have updates, and print them for my own reference.
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