Well, shooting a bunch, being cheap, err ah thrifty, one can work harden brass to the point of spring back when resizing. When the brass reaches that point, one can see where neck tension might vary. Annealing brass, for me at that point, was like voodoo. Since I still do annealing by hand; I only anneal at midnight, during a full moon. Maybe when I grow up, I can get one of those automatic annealing machines.
As far as ogive shape and bullet weight versus the length of the bullet; I’m sure that your statement is correct. However, if one visits the Berger website and looks at the 6.5 130 grain VLD, you will see that Berger recommends a specific twist rate. That, for an old country boy, is clue.