.375 Fl. N.E. 2 1/2'' Load Data & Reloading Guide

Rifle

Also known as: .375 Flanged Nitro Express, .375 N.E. 2.5", .375 Fl. N.E. 2.5"

About .375 Fl. N.E. 2 1/2''

The .375 Flanged Nitro Express 2 1/2 inch, introduced in the early 20th century, is a classic British cartridge that emerged from the transition toward smokeless powder. Originally developed for use in single-shot and double rifles, this caliber catered to hunters who desired a balance between power and manageable recoil for use in typically delicate and finely made firearms of the period.

Technically, the .375 Flanged Nitro Express 2 1/2 inch features a rimmed case, optimized for traditional break-action rifles. The case length of 2.5 inches accommodates various bullet designs, with typical bullet weights ranging from 235 to 270 grains. These bullets generally achieve muzzle velocities between 2000 to 2300 feet per second, providing sufficient energy for medium to large game at moderate ranges.

Ballistically, this cartridge exhibits sufficient accuracy and penetration for hunting applications, particularly in the African and Indian context where the caliber was historically favored. Its design caters to the hunter seeking reliable stopping power in a manageable recoil package, ideal for deer, boar, and similar-sized game.

For reloaders, the .375 Flanged Nitro Express 2 1/2 inch offers several advantages. The rimmed design simplifies extraction, which is particularly beneficial when using double rifles. Reloaders can experiment with various bullet weights and powder charges to tailor performance, enhancing versatility for specific hunting conditions. Additionally, components are often available from specialized suppliers, allowing for customization to meet the specific demands of this classic hunting round.

Technical Drawing

.375 Fl. N.E. 2 1/2'' cartridge dimensions, C.I.P.L3 = 63.5 mm, L6 = 82.55 mmL3 = 63.50 mmL6 = 82.55 mm

Based on C.I.P., the max. allowed case length is 2.500 in / 63.50 mm, the max. cartridge length is 3.250 in / 82.55 mm, and the max. allowed pressure is 31,908 PSI / 2,200 bar.

Technical Specifications

Maximum Pressure:31908 PSI / 2200 bar
Case Volume:68 Grains of Water
Primer Size:Large Rifle (LR)
Safety Standard:C.I.P. (Datasheet)
Bore Area:70.14 mm²
Barrel Diameter:0.375" / 9.5 mm
L3:2.500" / 63.50 mm
L6:3.250" / 82.55 mm

Start Calculating to Develop your own Load Data for .375 Fl. N.E. 2 1/2''

Use our professional ballistics calculator to develop safe and accurate load recipes for .375 Fl. N.E. 2 1/2''.

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Standard Load Data — .375 Fl. N.E. 2 1/2''

Select your desired cartridge and bullet weight below to access the corresponding load table. From there, you can choose any listed load recipe and transfer it directly into the ballistics calculator for further refinement, optimization, and precision tuning.

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Frequently Asked Questions

The maximum pressure for .375 Fl. N.E. 2 1/2'' is 31,908 psi | 2,200 bar.

.375 Fl. N.E. 2 1/2'' typically uses a Large Rifle (LR) primer.

The case capacity of .375 Fl. N.E. 2 1/2'' is approximately 68 grains of water (H₂O).