DWM was a reknowned German company and used quality steels. One of the original Mauser brothers was involved with the company (I can't remember the details). I have a couple of Mausers in military form that were made my DWM:

- M1903 Turkish Mauser, likely an early G98made by DWM that was converted to 8x57 and M1903 configuration at the Ankara Turkish arsenal in 1935, all original stampings were removed at the same time.

- M1904/39 Portuguese Mauser (also called "Vergueiro"), made originally by DWM in 6.5 calibre and converted to 8x57 in 1939, all original stampings left intact - even the calibre designation. Small ring action that is a mix of Mauser 98 and Mannlicher - very smooth action. These used to be converted into sporting firearms. The steel is good but it is only a small ring action and it doesn't have the bolt shroud of the 98 (for deflecting gases away from the shooters face in the event of a case or primer failure). Better off left alone I reckon.

It's the Spanish actions that you have to worry about - Oviedo was the company I think, and they made M93/5 actions and rifles. Some were converted to 7.62 Nato and these are suspect in the strength of steel used. They suffer bolt lug setback with continued use with normal Nato strength loads.

I don't think that there were any crook M98 military actions made. Even towards the end of the war the steel was good. They did take shortcuts on stock metalwork and fittings though (stamped trigger guards, omitting bayonet lugs and even modified gas holes on the bolts).