.450 Black Powder Express

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.

.450 Black Powder Express
TypeRifle
Place of originUnited Kingdom
Production history
Designed1870s
Specifications
Case typeRimmed, 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 length3.25 in (83 mm)
Overall length4.11 in (104 mm)
Case capacity136.3 gr H2O (8.83 cm3)
Primer typeKynoch # 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, Kynoch and Taylor.
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