How 'bout this thought, or revelation: It is the >>Express Barrels<< that are proofed/proved to a certain level, not particularly the kalibre. So in fact, one could use an >>Express Barrel<< that passed >>Express Proof<< for a diameter of 99.7(9,14mm)?? Now it may be that I am the only one leading the charge from behind???

Hochachtungsvoll,

Raimey
rse