What happens "when the barrel tells them to" in the middle of a match? Do they have time to stop, clean and season the bore before going back to the target?
In a small bore prone match, you start dropping points, whether they are unforced errors or not, for all practical purposes, you are done for the day.
The guy who won last weekend, he only dropped two points, and if he had dropped three, someone else would have got it.
If the match has several relays you will have enough time between relays to clean your barrel, but you are still out of the competition for #1.