There are quite a few other shooting sports organizations that support firearm ownership and the shooting sports.
If you are looking for an organization that is working to maintain or even improve access to public land … TRCA
I haven’t heard of TRCA.
The only one I could find is the Toronto and Region Conservation Authority.
There is a TRCP (Theodore Roosevelt Conservation Partnership) that fights for public land access. They are involved with gaining access to the 16.43 million acres of public land that is land locked.