I can tell you one thing about the P.O.Ackley books that is important to know.There are many loads in there with familiar powders,like 4831 and 4895.These are military surplus powders from long ago,WW 2 vintage.
Do not use the provided data with modern powder.Trust me on this one!!
Use modern loading manuals,and if you are resurrecting an old wildcat,do not apply the data!Modern powders have significantly different max loads than old powders.
And,I'll have to say I'll stay loyal to Mr P.O Ackley.Other folks can disagree,thats OK.