Re: More powder with longer c.o.l.
What Berger said is not a rule, but a consideration among many.
Y'all are too hung up on books instead of real life results.
The people who puke load information into books don't have your chamber/barrel, or your lot of powder/primers/bullets, or your dies. So books are no more than a loose reference.
You have plenty of pressure signs before reaching any pressure 'problem', and you need to load for best results this side of any real problem. That means, forget the books and watch what's going on with YOUR gun and YOUR components.
What Berger has said here can be taken out of context, and the theory in it is still dependent on your cartridge, & chosen load components.
For instance, moving a bullet forward would not enable more of certain powders with certain cartridges, if doing so newly puts the bullet into the lands. Adding more of these powders here could produce actual pressure problems because of higher pressure needed for engraving(without a run).
However, accounting for extra capacity in long seating, more of a slower powder could be used to keep a good fill, and with increased velocity(depending on cartridge & barrel length), without pressure problems.
See, it's not a rule, but a consideration.