The .30-30 (pronounced thirty-thirty) cartridge was America’s first small bore sporting round that used smokeless powder. The round served as a transition between the traditional black powder of the 18th and 19th centuries and the smokeless powder that became popular during the turn of the 20th century and remains so today.
Learn the History of 30-30 Ammo https://ammo.com/rifle/30-30-ammo#caliber-history at Ammo.com.