Outers Laboratories "Gunslick" grease with graphite was a staple for decades. Pretty good lubricant for hard-working bearing surfaces, not so much for small parts and minimal clearances. Every Outers-brand cleaning kit came with a small tube of Gunslick.
In more recent years I have moved toward pure white lithium grease for such uses. Usually available in auto parts stores, small squeeze tubes or cartridge-sized for grease guns. Very inexpensive. Can hardly be said to have a melting point and remains effective even in the coldest climate. Particularly effective when lubricating dissimilar metal surfaces (steel slide on alloy-frame pistol, or similar applications) because it prevents galling of the metals under stress. A small tube (4-oz or so) will last many, many years.
I suppose if you were really into tradition you could purchase a small container of powdered graphite and mix it into the lithium grease, maybe end up with something similar to the old Outers' product. Graphite is frequently used for lubricating lock mechanisms and some automotive purposes, so shouldn't be too hard to find.