10mm Starline Brass Cases 100 Count

Starline 10mm Cartridge Cases – 10mm Caliber Brass Casings, Bulk Pack of 100 Units

Starline Precision Reloading Brass is engineered to meet the most stringent manufacturing tolerances, ensuring each metallic cartridge case is produced with exceptional dimensional consistency and reliability. These 10mm caliber brass casings are specifically designed for handloaders and ballistic enthusiasts who demand superior quality and performance in their reloading components.

All Starline cartridge cases are manufactured in strict accordance with SAAMI (Sporting Arms and Ammunition Manufacturers’ Institute) specifications, guaranteeing compatibility and safety with factory ammunition and firearms chambered for 10mm Auto. The cases undergo a specialized heat treatment process that enhances the metallurgical properties, increasing tensile strength, hardness, and overall durability. This treatment ensures that the brass can withstand the repeated pressures and stresses of firing cycles while maintaining structural integrity and longevity.

These casings are made from new, virgin brass with no primer pockets pre-primed, allowing reloaders full control over primer selection and seating. The brass features a clean, smooth surface finish, ideal for precision resizing, trimming, and chamfering operations prior to bullet seating and powder charging.

Reloading Preparation Guidelines:

Due to manufacturing variances and potential deformation during shipping, the case mouths may not be perfectly concentric or round. To guarantee optimal bullet seating and consistent chambering, it is recommended to run the case mouth through a dedicated expander die. This process will re-round the neck, slightly flare the case mouth for easier bullet insertion, and remove any burrs or rough edges that could impede proper bullet alignment or seating depth.

Before loading, carefully trim each case to the correct length using a precision case trimmer, then chamfer and deburr both the inside and outside of the case mouth. This preparation reduces bullet damage and ensures uniform neck tension, which is critical for consistent ballistic performance and accuracy.

Additional Notes:

Reloaders may observe discoloration or spotting on the neck and body of these new brass cases. This is a normal result of the annealing process—a controlled heat treatment performed by the manufacturer involving rapid heating to a precise temperature followed by quick cooling. Annealing softens the brass in the neck and shoulder area, providing the necessary ductility to securely hold the projectile while allowing the case to expand and contract during firing without cracking or splitting.

The visible oxidation or coloration is simply a residue from this metallurgical process and does not affect the performance or safety of the cartridge cases. Proper cleaning and polishing before reloading can remove these surface marks if desired.

Starline 10mm brass casings represent a premium choice for reloaders seeking high-quality, reliable, and consistent metallic components optimized for precision shooting, competitive target practice, and tactical applications.