.577/500 No. 2 Black Powder Express

.577/500 No. 2 Black Powder Express
Illustration of the 2+3⁄4-inch and 3+1⁄8-inch .577/500 No 2 Black Powder Express cartridges
TypeRifle
Place of originUnited Kingdom
Production history
DesignedBefore 1879
Specifications
Case typeRimmed, bottleneck
Bullet diameter.507 in (12.9 mm)
Neck diameter.538 in (13.7 mm)
Shoulder diameter.560 in (14.2 mm)
Base diameter.641 in (16.3 mm)
Rim diameter.726 in (18.4 mm)
Case length2.83 in (72 mm)
Overall length3.40 in (86 mm)
Primer typeKynoch #31A
Ballistic performance
Bullet mass/type Velocity Energy
300 gr (19 g) 1,870 ft/s (570 m/s) 2,340 ft⋅lbf (3,170 J)
340 gr (22 g) (factory load) 1,925 ft/s (587 m/s) 2,800 ft⋅lbf (3,800 J)
Source(s): "Cartridges of the World" [1]

The .577/500 No. 2 Black Powder Express, also known as the 12.7mm British No. 2, is a British centerfire fire rifle cartridge.

  1. ^ Barnes.