Yep. A hit anywhere on the target counts.
Timer goes beep / Partner says go
Shoot until you get a hit. Time stops when you get a hit.
-(if you're shooting on paper you might have to check the target after each shot to ensure you hit unless you can call your shots)
I have a 12x24" chunk of steel plate. Shooting steel would make detecting hits at 100 easier. I assume you'd have no problem with the steel versus paper?