I imagine you can't take turns easily once there's a hole in the ship.
On the other hand, there are legitimate predators that will hunt and eat humans in Siberia. One team encountered wolves that they had trouble fending off, so they upgraded the pistol to a more formidable shotgun/rifle combo.
Unlikely that a handgun bullet passing through a skull will still have enough velocity to breach the hull? Even if it did, they'd just need to be deliberate with their aim vis-a-vis a steel plate.
On the other hand, there are legitimate predators that will hunt and eat humans in Siberia. One team encountered wolves that they had trouble fending off, so they upgraded the pistol to a more formidable shotgun/rifle combo.
If the gunshot creates shrapnel or propels the gun away, it might create additional hardship for the remaining crew.
I don't think this is an ideal mechanism.