I've got Lyman reloading manual and Cast bullet manual, bought new, from around 1980 and more recently bought Lyman #49, #50 and the current Cast bullet manual. They are a good source and comparison of information. I refer to mine frequently, even the old ones.
Turret presses do not fit my preferred methods of reloading and I do not feel turret presses are worth the money spent on them, although the auto index Lee concept maybe has some value. I do understand having lots of holes in the turret.
Getting past the strength/flex issues old turret press designs have been historically plagued with, you can have multiple die sets installed on one turret as already noted, or extra dies for specialized tasks, or any other "out-of-the-box" die layout the reloader can think of.
But, like most things, different strokes for different folks and turret presses off an option to consider for reloaders
