Also, some rounds, like the 270 and 25/06, already over bore and all the available case capacity can't be used as it is. Even Ackley himself said this in his book Handbook for Shooters and Reloaders.
That's about as obsolete a theory as is possible to get. A bunch of powders available today, that Ackley didn't have, have changed the playing field.
Check out the powders that Ackley used in his book. Not much for slow burners there...
