It looks to me like the Stanislaus National Forest is a "Firearms Friendly" forest.
The rules are listed on this web page with the reminder to check with the District Ranger.
"Practice safe firearms use while on the Stanislaus National Forest:
Stay more than 150 yards from any campground, building or other occupied area before shooting.
Aim away from other people, campsites, campgrounds, houses or other buildings.
Ensure that animals, plants and other forest resources will not be injured or damaged.
Trees, signs, glass bottles, and clay pigeons are never appropriate targets.
Have a solid dirt backstop; see the entire path of your bullet; ensure that no objects that could cause a ricochet are within your line of fire.
Be off roads and trails when you shoot, and aim away from lakes, ponds and streams.
Retrieve all shell casings and targets before leaving.
While the Stanislaus National Forest does not have any area set aside for target shooting, some Forest visitors have found that certain areas are more desirable for firearms use than others. Contact the nearest Ranger Station for information on such places."
[url]http://www.r5.fs.fed.us/stanislaus/visitor/firearms.htm[/url]