JMARK,
I was there for about 3 hours Saturday and those extinguishers were all over the place then too.
Last year in January my son, brother in-law and 3 buddies showed up there and there were extinguishers and all kind of other stuff there lying around. Although we put up paper targets, we still took some shots at some of the junk and less than 5 minutes later a forest ranger with "Law Enforcement" written on the hood of his car pulled up and gave each one of us a $90.00 warning ticket and a promise of a real fine for the second offence for shooting at unauthorized targets.
Even though we didn't bring the junk, he did catch us red handed shooting at it. He was a nice and polite ranger but did say that they are getting fed up cleaning the mess.
Well, I learned my lesson and will NEVER shoot at anything but dirt clods and paper targets again.
Like you, I try and pick up more trash than I bring.
If that place got shut down I would have a heart attack. I've shot there at least once a week consistantly for 3 years.
Base-Rigger