I had the other dreaded one SB in a speed shoot where we were allowed to fully load the mags (Yay!) got the first 10 out of the tube, only to suffer a rim over shoving the last charger in and trying to close the bolt by the time I sorted that the fat lady had sung!
Wonder how many poor SOB's suffered the same fate in the heat of battle with the enemy right on your trench and you suffer a rim over, you may both have both bayonets on your rifles thing is his will rifle will go bang yours won't