.375 Flanged Nitro Express

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375 Nitro Express 2½ inch Velopex
Place of originUnited Kingdom
Production history
Case typeRimmed, tapered
Bullet diameter.375 in (9.5 mm)
Neck diameter.397 in (10.1 mm)
Base diameter.456 in (11.6 mm)
Rim diameter.523 in (13.3 mm)
Case length2.5 in (64 mm)
Overall length3.1 in (79 mm)
Ballistic performance
Bullet mass/type Velocity Energy
270 gr (17 g) 1,975 ft/s (602 m/s) 2,340 ft⋅lbf (3,170 J)
Test barrel length: 25 inches
Source(s): Kynoch[1] & Barnes & Amber.[2]

The .375 Nitro Express 2½ inch Velopex , was a nitrocellulose (smokeless) powder cartridge introduced in 1899.


A hunting cartridge produced for single-shot and double rifles, the .375 Flanged NE is a slightly longer version of the .303 British necked out to .375 caliber. The .375 Flanged Nitro Express should not be confused with the .375 Flanged Magnum, a much longer and more powerful all-round African hunting cartridge.

The .375 Flanged NE is not considered suitable for hunting dangerous game, but is considered a good low velocity medium bore cartridge for woods and plains game with superior performance to the .45-70.[3]

See also[edit]



  1. ^ "Kynoch, .375 2½ inch". Archived from the original on 2015-01-03. Retrieved 2014-12-31.
  2. ^ Barnes & Amber, p 432.
  3. ^ lee-enfieldrifles.com