I go with Ron's assessment.
Boehler was (and still is) an Austrian steel supplier who had a subsidiary in Germany, with a head office in Berlin in the early 1900s. The main share holder of the German branch was none other than Isidor Loewe, who also had the Ludwig Loewe & Cie under his umbrella, including daughter companies DWM and Mauser. Members of the Boehler family retook control of the company after the death of Loewe. This change of ownership roughly corresponds with the disappearance of the Boehler markings on DWM barrels, it's not unlikely that the outbreak of the war was also a reason to obscure the source of barrel material a bit more.
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