Notice that for the factory mounted scopes Mauser used receivers with large ring and inside small shank (same diameter than on the 96') and that the dovetailed front base didn't weaken the barrel assembly.
Also, the German proof house standards are extremely high and severe and would not have tolerated such a fitting if they have had any suspicion of weakness.
Later, the actions were square bridged on the front ring to ease that kind of mount.

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