My definition of "camp rifle" seems to be a little different than most here.
I don't carry it anywhere. It hangs by a simple sling on a hook or is leaning against a wall in the corner. It might get very hot, it might be very cold for long periods. It is not ever cased. Its magazine is always loaded. It might not get shot for years. It might get wet. It will get dirty. It might bounce around for a long time in a truck or on a horse or dirtbike or quad. Ammunition is easily available. Can be cleaned with a knotted shoelace soaked in gasoline and lubed with a dipstick. It HAS to work when needed.
Synthetic stock, iron sighted, short barreled, spray and bake paint job, simple bolt action unaffected by dirt or moisture, inexpensive, in a caliber that can back up asking the bear to please get out of the cook tent.
For me that is an older push feed Winchester 70, or Remington 721 ect.. in preferably 30-06. Old bubbaed Mausers, 1903s, M1917s, Arasakas, Mosins, or Lee Enfields that have proven themselves dead nut reliable but ugly as sin and meet the above criteria also qualify.
A totally utilitarian tool that you are not afraid to ride hard and put away wet. Very similar to a "camp" axe or shovel and treated the same.