Under current ,stupid ,CIP rules 2" guns now are proofed at the same pressure and load as all 70mm chambered guns.This virtually excludes 2" guns from reproof or being sleeved as the majority of actions are too light to stand .
This is what we pay for being in organisations that are run by scientists and bureaucrats with no input from the gun trade , the proof masters no longer having any influence nor any discretion in theses matters .