Chamber shoulder and case shoulder gauge for .303?

[ireload2]

Yes, and the reason is that the radial (circumferential) elongation of approximately 10% exceeds the elastic limit of the brass in that part of the case.

Just my example that all strain of the brass is cumulative.
You can't discount stretching whether it is axial or radial or both combined.
The elastic nature of the LE action and the large clearance between the case head and the chamber tend to concentrate the damage to the case at the pressure ring.