Depends on the rifle. Like other bullets, regardless of construction, sometimes deep seating is best, other times it's not. My NULA .308 shoots the 168 TSX BT most accurately with the bullet seated at maximum recommended COAL for the cartridge, 2.81". A Cooper .270 is similar using the 130 TSX BT.
In developing a load, I start out initially loading 3 rounds with a less-than-max charge and seating the bullet just a bit short of engraving, then go .03" deeper, and finally .06" deeper. It's seldom one of these depths won't work well.
