NAME – 15.6x70mmR (20 Gauge 2 ¾ Inch) #3 Buckshot

TYPE – Shotgun shell

YEAR OF INTRODUCTION – 1890’s

COUNTRY OF ORIGIN – Great Britain

CASE TYPE – Rimmed straight

CARTRIDGE LENGTH – 6.22 cm (2.45 in)

CASING LENGTH – 7 cm (2.75 in)

CASE HEAD DIAMETER – 17.58 mm (0.692 in)

CASE RIM DIAMETER – 19.33 mm (0.761 in)

LOAD – #3 Lead Buckshot

LOAD WEIGHT – 29.8 g (1.05 oz – 460 grains)

PELLET DIAMETER – 1.35 mm (0.25 in)

NUMBER OF PELLETS – 20

WEIGHT OF PELLET – 1.49 g (23 grains)

TOTAL ROUND WEIGHT – 39.8 g (1.4 oz)

MUZZLE VELOCITY – 366 m/s (1200 fps)

NOMINAL BARREL LENGTH – 66 cm (26 in)

MUZZLE ENERGY – 1995 j (1471 ft/lb)

MUZZLE ENERGY PER PELLET – 100 j (74 ft/lb)

15 fps/in per 2 inchs bbl length from nominal