Great! Do you have a citation that I can quote?
When I was looking at land in Park, Custer, and Fremont counties, I talked with the sheriff's offices and they were the source of the 10+ acre information.
I also asked about shooting Class 3 and they all said to give them a courtesy call before I started shooting. That was so they could give educated responses to anyone who called in.
They all stated that projectiles could not leave the property.
I did buy the land prior to 2003.