If you like to shoot a particular type of bullet, like say the Speer Gold Dot, then it is a good idea to get a manual that is new enough to have data for the bullet you use. Ditto with a new powder.
Lee's manual just reproduced the load data from the powder manufacturers and added "how-to" material in the beginning (some of which is very good). But, nowdays you can get all the powder manufacturers' load data for free on the web, and it is up-to-data, there.
SL1
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