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There were various earlier designs and patents awarded, but the first revolvers (as in a single-barreled handgun with multiple firing chambers) that really caught on were those based on Samuel Colt's ratchet and pawl mechanism, patented in the US in 1836. That said, there was a flintlock revolver designed by Elisha Collier and patented in the UK in 1818 that saw some production in the early 1820s. Aggressive litigation against patent infringements gave Colt an effective monopoly in the US until the mid-1850s, when other manufacturers managed to get round Colt's patents.
From 1836 until the late 1860s, the most common ammunition for the larger caliber revolvers--over .30 inch--was "cap and ball": round lead balls, loose black power, and percussion caps. Reloading these was a bitch, though with most models, you could resort to the expedient of carrying several pre-loaded cylinders and swapping them out.
However, there were certain historically important models, like the Smith & Wesson Model 1 (first made in 1857), which used rimfire cartridges (in the case of the S&W Model 1, .22 Short).
The effective range of models like the Colt Paterson (1836), Walker Colt (1846), Colt 1851 Navy (.36 cal), and Colt 1860 Army (.44 cal) was estimated at around 50 yards. The sights on the Remington New Model 1858 were set for 75 yards, but this probably involved a dose of wishful thinking. Note that these ranges are roughly the same as those of modern-day handguns, which has a lot to do with the fact that the limitations on effective range are significantly more dependent on the capabilities of the user (due to the comparatively short radius and comparative instability of handguns) than the ballistics of the weapon itself.
Concerning your second question, effective models of multi-shot, single-barreled rifles started appearing in 1855, with the most notable models being the Volcanic lever-action rifle, and the Colt Revolving Rifle Model 1855. The Colt used paper cartridges, whereas the Volcanic used an improved version of the Rocket Ball metallic cartridge. The Volcanic Repeating Arms Company was short-lived, but its assets were used by its primary creditor, Oliver Winchester, to create the New Haven Arms Company, which developed the 1860 Henry rifle (named after its designer, Benjamin Tyler Henry), which was based on the Volcanic design. The Henry used a .44 rimfire cartridge. (In 1866, Oliver Winchester reorganized the company again and named it the Winchester Repeating Arms Company. This was also the year the Winchester 1866 rifle came out, which was a further development of the Henry.) Lastly, I should mention the Spencer rifle and carbine, which came out in 1860, and was chambered for a proprietary cartridge, the Spencer 56-56 rimfire. The carbine was widely used by Union cavalry in the Civil War, and several Union regiments used the rifle.
Effective range of the Henry and Spencer weapons was no more than 200 yards.
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