Sleek bullets with pointy noses have their ogive located further back than conventional bullets, so for a given OAL and distance from the lands sleek bullets require a shorter throat than bullets with more rounded nose profiles.
Said another way, with magazine length limiting how far out you can seat the bullet (when OAL is limited by mag length), pointy bullets require a much shorter throat to kiss the lands than round-nose bullets do. Or if mag length is not the limiting factor then there is limited case neck length to support the bullet, which also restricts OAL. Either way, when seating to longer and longer OAL, the more rounded the nose profile of the bullet, the sooner it hits the leade.
