What type of primers do the S&B .303 British brass cases require for assembly?

These unprimed brass cases require standard Large Rifle Boxer primers for assembly and handloading. They are manufactured to C.I.P. standards in the Czech Republic and feature uniform wall construction to fit conventional reloading presses and dies.

Are there any specific compatibility considerations when feeding these S&B .303 cases through a Lee-Enfield magazine?

Handloaders note that S&B .303 cases feature a slightly more squared-off rim edge profile compared to some original military specifications. To prevent potential rim jams in classic Lee-Enfield magazines, ensure your rounds are stacked carefully during loading.

Can these S&B unprimed brass cases be shipped to Western Australia via standard mail?

No. Due to state-specific firearms component transport regulations in Western Australia, firearm ammunition components such as unprimed brass cases cannot be sent via standard postal delivery and must be transferred through licensed channels.

What is the maximum operating chamber pressure rating for these Sellier & Bellot .303 British cases?

These cases are manufactured to handle C.I.P. proof pressure limits for the .303 British calibre, which specifies a maximum operating chamber pressure of 3,650 bar, or approximately 52,939 psi. Always ensure your handloaded powder charges stay safely within these established pressure thresholds.

303 British Brass Cases - S&B V337452

The S&B Sellier & Bellot 303 British Unprimed Brass Cases provide reloadable cartridge components engineered for assembling custom .303 British (7.7×56mmR) ammunition. Manufactured in the Czech Republic to C.I.P. standards, each drawn brass case features a rimmed, bottleneck profile with a standard rim diameter of approximately 13.72 mm (0.540 in) and a nominal case length of 56.44 mm (2.222 in). These brand-new cases feature standard boxer primer pockets designed for conventional reloading dies and presses, accommodating standard Large Rifle Boxer primers to develop consistent target or hunting cartridges.

Key Features

C.I.P. Compliant Dimensions: Built to standard specifications with a nominal case length of 56.44 mm and a rim diameter of 13.72 mm for correct chambering across .303 British platforms.
Drawn Brass Construction: Manufactured with uniform case wall profiles to withstand chamber pressures up to 3,650 bar (~52,939 psi).
Boxer Primer Pockets: Machined to standard Large Rifle Boxer dimensions, enabling straightforward depriming and re-priming with standard metallic reloading tools.
Rimmed Bottleneck Design: Features traditional headspacing on the rim, engineered for military surplus actions and commercial sporting chambers.

Product Specifications

Brand: Sellier & Bellot (S&B)
Manufacturer Part Number (MPN): V337452
Calibre: .303 British (7.7×56mmR)
Quantity: 20 pieces per pack
Case Type: Drawn brass, rimmed bottleneck
Primer Pocket Type: Large Rifle Boxer (unprimed)
Nominal Case Length: ~56.44 mm (2.222 in)
Nominal Rim Diameter: ~13.72 mm (0.540 in)
Maximum Operating Chamber Pressure: 3,650 bar (~52,939 psi)

Who is the S&B Sellier & Bellot 303 British Unprimed Brass Cases 20 Pack for?

Lee-Enfield service-rifle competitors — needs reloadable 303 British unprimed brass cases engineered to withstand standard maximum chamber pressures up to 3,650 bar (~52,939 psi) while supplying a precise 20-piece batch for working up consistent military-rifle match loads.
Hunters seeking handloaded hunting rounds — requires dedicated .303 British (7.7×56mmR) brass cases supplied in a 20-piece pack to assemble custom projectile profiles and tailored powder charges for sporting field use.

Less suitable for: Shooters requiring a ready-to-load component that eliminates the step of seating Large Rifle Boxer primers, who are better served by fully primed cartridge cases, or Western Australian handloaders seeking direct postal delivery, who require dealer-transferred component shipments to satisfy local carriage regulations.

SKU	SAB42186LP
Model #	V337452
Brand	S&B
Shipping Weight	1.0000kg

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Sellier & Bellot V337452 Brass Cases 303 British 20 Pack

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