|.369 Nitro Express|
|Place of origin||United Kingdom|
|Designer||James Purdey & Sons|
|Case type||Rimmed, bottleneck|
|Bullet diameter||.375 in (9.5 mm)|
|Neck diameter||.398 in (10.1 mm)|
|Shoulder diameter||.475 in (12.1 mm)|
|Base diameter||.543 in (13.8 mm)|
|Rim diameter||.616 in (15.6 mm)|
|Case length||2.69 in (68 mm)|
|Overall length||3.6 in (91 mm)|
|Case capacity||102.3 gr H2O (6.63 cm3)|
|Test barrel length: 31 in|
Source(s): Kynoch & Cartridges of the World.
The .369 Nitro Express is a rimmed cartridge originally designed for use in Purdey's own double rifles. The cartridge offers almost identical ballistic performance to the .375 H&H Flanged Magnum, firing a projectile of the same .375 in (9.5 mm) caliber.
As is common with cartridges for double rifles, due to the need to regulate the two barrels to the same point of aim, the .369 Nitro Express was offered in one loading, firing a 270 gr (17 g) projectile at 2,525 ft/s (770 m/s).