A single bullet causing multiple gunshot wounds in a range accident seemed plausible, so I checked to see if it ever actually happens. Turns out it does:

One bullet hurts two men in Bridgeport shooting range accident

Two men injured in Casselberry gun range accident

Man shot in both arms at Bellevue gun range sues

As a result, I doubled up my minimum range trauma kit to treat two different wounds. Quadrupled up on gloves in case two different people get injured and I have to switch off between them.