The Parrott rifles were developed by Robert P. Parrott, and patented in 1861. They were easy to manufacture, inexpensive, and accurate, so much so that the Confederates manufactured their own version of the piece. Parrott rifles are most readily identified by the wrought iron, reinforcing band that was shrink-fitted around the breech. There are two different versions of this artillery piece. The 1861 version has a 2.9 in (7.37 cm) bore, while the 1863 version, shown above, had a 3 in (7.62 cm) bore. The outward distinction between the two versions is the 1863's lack of a muzzle swell. The 10-pounder Parrott used shell, spherical case, and cannister. The Model '63 could fire ammunition for the Model '61, but not vice versa.
Bore Diameter 3.0 in (7.64 cm) Tube Material Cast and Wrought Iron Tube Length 78 in (198 cm) Tube Weight 890 lb (404 kg) Powder Charge 1 lb (0.45 kg) Range (5° Elevation) 2,000 yd (1,829 m) At Gettysburg (total M61 and M63) 60 (USA); 42 (CSA)
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http://schwartz.eng.auburn.edu/ACW/arty/10parrott.html