From the discussions about bears & guns, the .30-30 gets tossed around alot & I pondered, did they have a lever action in 1830? No they were still using muzzle loads back then, so then, where'd the 30? Come from? 1930 production dates (like the 06 in .30-06, denoting the 1906 Springfield)? Nope, the .30-30 lever action was around long prior to 1930...
So I digs around & find this:
Although the original name is .30 WCF, the -30 in the designation was added to the name by Marlin, who did not want to put the name of rival Winchester on their rifles when they were chambered for the cartridge soon after its introduction. The -30 stands for the standard load of 30 grains (1.9 g) of early smokeless powder, which was on par with IMR/DuPont's 4064. Over time Marlin's variation on the name stuck, though ".30 WCF" is also used.