Kind of like fighting a forest fire, put out out one and another jumps up.
In 1929 A. F. Stoeger got Townsend Whelen to design a custom sporting rifle for them as they were entering the custom rifle market. Because Stoeger had a working relationship with Mauser it seems they sent a copy of the blueprints to Mauser, Mauser converted the measurements to metric, end of story.
Back before WWI Mauser made at least one rifle using the 1903 Action, this had NOTHING to do with the later Stoeger drawings.