The next round to be fed from the magazine will automatically push any dirt out of the way. Some people may object to the slight side play a Mauser has when drawn to the rear. This is a safety feature designed to ensure enough clearance for reliable operation under dusty or muddy conditions. This slight play vanishes when the bolt is locked and a cartridge is chambered. The ability to handle escaping gas from a blown or pierced primer or ruptured cartridge case is better handled by a Mauser '98 design than on any other action.
Gas entering the firing pin hole meets a flange or collar on the firing pin.
Large holes on the bolt body bleed off this gas before it reaches the cocking piece. Any gas entering the bolt's right side escapes via the ejection port. Any gas vented down the left locking lug raceway exits via the gap between the bolt and the receiver sidewall. Any gas managing to reach the cocking piece is deflected sideways by the wide gas flange on the bolt shroud. Most other bolt action rifles lack this bolt flange or lack one of sufficient size to protect the shooters eyes effectively.