FWIW - If I understand the Springfield Armory procedures correctly, our barrels were proofed with special (sub-caliber) cartridges before they were rifled, out-side contours were turned, and several straightening operations were performed.

The barrels received this initial proofing before being "finished" & screwed into their ultimate Krag actions.

(The actions were likely proofed in a different process).

IIRC - A percentage of finished Krags, from a 'lot', underwent an additional proof firing.