Here's a couple of neat ones for the "the founding fathers never had weapons like this" crowd, two 17th century flintlock repeating rifles!
This is a Kalthoff repeater, the designers of which weren't about to let silly minor things like "nobody has invented the unitary firearm cartridge" stop them making a lever-action rifle. These had at least two and sometimes three magazines (powder, balls, and sometimes primer); the two-mag versions needed to be manually primed, while the three-mag version was a true 6-shot levergun.
This is a Cookson repeater, a 7-shot 1750 rifle based on a mechanism developed in 1680. This one's simpler; the lever is linked to a drum that rotates and the balls and powder are in the stock, you reload by tilting the gun forward and operating the lever to rotate the drum in line with the stock and then back to the barrel, and it's self-cocking and self-priming too!