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Gases from a ruptured case on a small ring Mauser go back along the bolt, and inside the bolt along the firing pin. If you compare an m98 bolt shroud to small ring mausers you'll see a flange on the m98 that is absent on the earlier small ring mausers.
The flange on the bolt shroud prevents gas from shooting directly back.
The dual gas ports on the underside of the m98 bolt allow the gases that would flow directly back along the bolt to vent downward into the magazine well. If your bolt lacks exhaust ports (some small ring mausers were retrofitted with gas ports in the bolt, some not).
Those two features are important for safety, and the reason that 6.5x55, 7x57, and 8x57 are loaded to low pressure standards in the US, because all those rounds were chambered in small ring mauser rifles.
Jimro
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Machine guns are awesome until you have to carry one.
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