10.66mm six barrels Nobel machine gun 

Bulgarian designation :Шестцевни 10,66 мм картечница “Нобел”Russian designation :6-ствольная 4,2-линейная скорострельная пушка обр. 1873 г.Calibre :10.66 mmWeight of the barrel :49.14 kgWeight of the carriage :90 kgWeight in action :230 with 216 cartridgesWeight in marching order :528 kgGun length :1016 mmBarrel length :660.5 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 :1200 mRate of fire :600 rounds per minuteAmmunition :2572 roundsTransport :drawn by two horsesCrew :3 men – firer, loader, driverRemarks :Mechanical machine gun (mitrailleur) introduced in the Russian Army in 1873 and manufactured by the firm Ludwig Nobel of Sankt Petersburg. It was based on the ten barrels Gatlin-Gorlov machine gun, modified and improved by the Russian col. Gorlov and engineer Vladimir Stoyanovich Baranovski. It 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 4 six-barrels machine guns were still in service.