[T. O'Heir]

In the old days, when shooting pins and plates with a shotgun, the minimum shot size was Number 2's. Smaller shot would bounce back and hit spectators. Got hit myself a couple times with bouncing bullets. One of which was a very long bouncing FMJ .45 at Second Chance. Got hit on the leg from a lot farther than 10 yards.
Buddy of mine took a slice of lead .45 bullet in his forehead from 7ish yards while practicing on pin shaped plates. The slice went through the bill of his hat, missed his glasses and stuck in his eye brow. The point of the slice bent upon impact on his skull and grabbed the hide so it required ER removal.
Point is that 10 yards may or may not be enough.