Outside of the NFs UOC of handguns is basically banned. In the NFs it is banned anywhere shooting is prohibited.
The Firearms in Forests and Parks thread that you linked has the most recent and useful information. There is also a printable version of that first post here
The only thing to look out for shooting closures. It appears that some of the SoCal NFs are posting closures to shooting throughout the forests. This also makes them no carry zones for handguns, except in a lock box or in your camp site.