I only used the one that had information on the reloader I used.
As for reloading powder, I relied on the information from the powder companies. Use to get that info free from the gun stores; now it's available on the internet. I still have printouts on the computer printer from the late 90's.

Of course, I like to save money. And I don't try to overload the case. Start with recommended lows and worked up to within recommended maximums. If you wanted to shoot a 300 Win magnum load, buy a 300 Win. Mag. rifle.