Valad, the "at the lands" philosophy originated in the "gimbel" loading method that was prevalent in 1970's benchrest shooters.
As for jamming into the lands, I refuse to do so for the reasons mentioned above. I just have this aversion to a magazine full of powder and a bullet stuck in the lands.
The general rule for safe reloading is start with your longest length fist, and work up your powder charge, then work your AOL shorter. This helps avoid the pressure issues you mentioned above.
In general, I like a full case. That being said, perhaps my most accurate load in the .338 WM is BLC-2 behind a 200gr bullet.
