10.66mm ten barrels Nobel machine gun 

Bulgarian designation :десетцевни 10,66 мм картечница “Нобел”Russian designation :10-ствольная 4,2-линейная скорострельная пушка обр. 1871 г.Calibre :10.66 mmWeight of the barrel :163.8 kgWeight of the carriage :294.84 kg (4 pdr artillery carriage)276.5 kg (light carriage)Weight in marching order :720 kg (4 pdr artillery carriage)1104 kg (light carriage)Gun length :1524 mmBarrel length :826 mmBarrel groovesnumber :6depth :0.28 mmwidth :3.90 mmCartridgeweight :39.5 glength  :75 mmmetal :brassBulletweight :24.1 glength  :27 mmcharge :5.06 g of black powdermetal :hardened leadMuzzle velocity :430 m/sMax. range :1493 mElevation :+ 60° / + 50° (with light carriage)Traversing angle :60°Wheels height :1.09 mRate of fire :250/300 rounds per minuteAlimentation :aluminium box with 24 rounds (mod. 1871)four boxes with 25 rounds each (mod. 1874)Ammunition :6048 rounds (with 4 pdr carriage)6720 rounds (with light carriage)Transport :drawn by four horsesCrew :7 menRemarks :Mechanical machine gun (mitrailleur) introduced in the Russian Army in 1871 and manufactured by the firm Ludwig Nobel of Sankt Petersburg. It was based on a 12.7mm six barrels Gatlin machine gun bought in 1862, and on a 10.7mm ten barrels machine gun designed by col. Aleksandr Pavlovich Gorlov, a member of the Russian Artillery Committee. In the machine guns delivered to the Bulgarian Army the barrels were mounted on the carriage of the 4 pdr field gun with an improved iron frame. They fired the same ammunition as the Berdan 2 rifle. At the beginning of the Russo-Turkish War 16 ten and six barrels machine guns were delivered to the Bulgarian National Army. At the beginning of the Balkan War 8 ten barrels machine guns were still in service.

Ten barrel machine gun with light carriage and artillery limberPictures from Sofia Military Museum