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There are three classes of rifles used, single shot, lever action, and malcolm scopes.  
Single Shots are rifles with the hammer exposed such a the Sharps, Winchester, and Remington Rolling Block. Calibers generally used include 38-55, 40-65, 45-70, and 45-90. 
Lever Action rifles use a lever located around the trigger guard area to load fresh rounds into the chamber when worked. They most often use pistol caliber cartridges ranging from 32 to 45 long colt. 

Malcolm Scopes refers to the vintage rifle scopes invented by William Malcolm. This category of shooters can use these scopes on any of the approved single shot rifles if they are 6x power or less.
Note: 45-70 Lever Action will shoot in the Single Shot category.