87mm light field gun M. 1867

Bulgarian designation :4-фунтово оръдиеRussian designation :4-фунтовая медная пушка обр. 1867 г.Calibre :86.8mm L/20Weight of the barrel :345.4 kgWeight of the breech-block :30.7 kgWeight of the carriage :290.7 kg (without wheels)Weight in action :780 kgWeight of the limber :504 kgWeight in marching order :1284 kgBarrel length :1.740 mBarrel groovesnumber :12depth :1.27 mmwidth :15.62 mmBattering charge :610 g of black powder (full charge)153 g (reduced charge for cast iron shell)Cast iron s.length :2 calibres (175 mm)weight :5.73 kg – charge: 205 g of artillery gunpowderfuze :percussion fuze M. 1875 – 205 gmuzzle velocity :306 m/s (full charge)137 m/s (reduced charge)max. range :3414 m (full charge)1067 m (reduced charge)Shrapnelweight :5.93 kg - charge: 68 g140 / 150 bullets x 10.6 g x 12.7 mmfuze :10 sec. time fuzemuzzle velocity :301 m/smax. range :2240 mCanister shellweight :6.61 kg – charge: 94 g of artillery gunpowder111 bullets x 12.7 mmfuze :percussion fuze M. 1875 – 205 gmuzzle velocity :288 m/smax. range :2560 mCase shotweight :4.81 kg – 48 balls x 74 g x 24 mmmax. range :533 mSharohaweight :? kg – charge : 16 g34 balls x 24 gmax. range :1707 mLength of the line of sight  :906 mmElevation :+ 21°30’ / - 7°Wheelsweight :144 kgheight :1394 mmtrack :1473 mmTransport :drawn by six horsesAmmunition :limber : 18 shellsammunition wagon : 56 shellsRemarks :Russian bronze light field gun delivered in 1878, after the war of Liberation. The carriage was made of iron and had no seats for the gunners. It could fire also a shell with spherical solid head (шароха) and an incendiary shell, which was employed by the Russian artillery only till 4 May 1875. The sigh was not graduated according with the range, but was marked in Russian lines (2.54 mm) that did not correspond directly to the distance expressed in meters, for example a distance of 500 m corresponded to 6 ½ lines, while a distance of 1000 m to 15, and not 13 lines.