The Sellier & Bellot 7x57R Rimmed Unprimed Brass Cases (product code V337362) provide high-grade, reloadable cartridge cases engineered specifically for break-action hunting firearms. Packaged in quantities of 20 pieces, these unprimed cases feature an external extraction rim and Boxer-type Large Rifle primer pockets. Manufactured from drawn brass with factory-annealed case mouths and necks, they are designed to conform to a maximum C.I.P. case length of 57.00 mm and operate within established European sporting pressure limits.

Key Features

• Factory Annealed Necks: Case mouths and necks undergo factory thermal annealing to ensure consistent chamber sealing, reliable neck tension, and prolonged brass life over multiple reloading cycles.
• Break-Action Extraction Rim: Engineered with a dedicated external rim for positive, mechanical extraction in single-shot Kipplauf rifles, drillings, and double rifles.
• Standard Boxer Priming: Configured with standard Boxer Large Rifle primer pockets, allowing handloaders to utilise standard reloading dies and conventional primer seating tools.
• C.I.P. Specified Dimensions: Formed to C.I.P. standards with a maximum overall case length of 57.00 mm, ready for mandatory initial full-length sizing, neck expansion, and deburring before loading.

Specifications

• Brand: Sellier & Bellot (S&B)
• Manufacturer Model: V337362
• Calibre: 7x57mmR (Rimmed Mauser)
• Material: Drawn brass, factory annealed
• Case Condition: Unprimed
• Primer Pocket Compatibility: Large Rifle, Boxer type
• Package Quantity: 20 pieces
• Maximum Case Length: 57.00 mm
• C.I.P. Maximum Average Pressure (Pmax): 3,400 bar

Who is the S&B Sellier & Bellot 7x57r Rimmed Unprimed Brass Cases 20 Pack for?

• Handloaders for European break-action platforms — Requires dedicated 7x57R unprimed brass cases featuring an external rim and Boxer Large Rifle pockets to ensure reliable extraction and smooth cycling within the 3,400 bar C.I.P. maximum pressure envelope typical of Kipplauf single-shot rifles, drillings, and combination guns.
• Medium big game hunters using combination rifles — Needs consistent 57.00 mm maximum length reloadable brass to assemble custom game loads in 20-piece batches tuned specifically for the lower-pressure locking systems of rimmed break-open hunting platforms.

Less suitable for: Shooters loading for standard rimless 7x57mm Mauser bolt-action rifles, who require standard rimless 7x57 brass rated to higher operating ceilings (3,900 bar C.I.P.) to match bolt-face extractors.