.450 Black Powder Express

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.450 Black Powder Express
Type	Rifle
Place of origin	United Kingdom
Production history
Designed	1870s
Specifications
Case type	Rimmed, straight
Bullet diameter	.458 in (11.6 mm)
Neck diameter	.479 in (12.2 mm)
Base diameter	.545 in (13.8 mm)
Rim diameter	.624 in (15.8 mm)
Rim thickness	.040 in (1.0 mm)
Case length	3.25 in (83 mm)
Overall length	4.11 in (104 mm)
Case capacity	136.3 gr H2O (8.83 cm3)
Primer type	Kynoch # 40
Ballistic performance
Bullet mass/type Velocity Energy 270 gr (17 g) Lead copper-tubed 1,975 ft/s (602 m/s) 2,340 ft⋅lbf (3,170 J) 310 gr (20 g) Lead solid 1,800 ft/s (550 m/s) 2,240 ft⋅lbf (3,040 J) 325 gr (21 g) Lead copper-tubed 1,775 ft/s (541 m/s) 2,280 ft⋅lbf (3,090 J) 350 gr (23 g) 2,150 ft/s (660 m/s) 2,340 ft⋅lbf (3,170 J) 365 gr (24 g) Lead solid 1,700 ft/s (520 m/s) 2,340 ft⋅lbf (3,170 J)
Source(s): Barnes,[1] Kynoch[2] and Taylor.[3]

The .450 Black Powder Express, also known as the .450 31⁄4-inch BPE, was a popular black powder cartridge in the late 19th and early 20th century.^[1]