[Yeah, you can assume an infinite supply of targets that are common property. As for gun-range etiquette, I'm going to defer to y'all sa to how you want to handle that. The last time I was at a range was like 20 years ago, and it was an outdoors range in the USA, not an indoors one. I actually don't remember much. zuhrovet might have suggestions; I think she has some more recent gun experience.]