Sierra 7.7mm 303 Cal 180gr SPT

Sierra 7.7mm 303 Cal 180gr SPT

The Sierra 7.7mm 303 Cal 180gr SPT bullet component, identified as #2310, is purpose-built to suit a wide range of military surplus rifles chambered in .311-inch diameter cartridges. These include classic service arms such as the British Lee-Enfield, Japanese Arisaka, Russian Mosin-Nagant, and various SKS or AK-pattern rifles from former Soviet bloc countries. Designed to enhance the hunting versatility of these often overlooked platforms, the 180 grain Spitzer bullet offers a reliable balance of ballistic efficiency, terminal performance, and feeding reliability.

This bullet features a Spitzer profile and a double-taper heavy jacket unique to Sierra’s construction. These design features promote dependable expansion and deep penetration, particularly on medium to large game. The aerodynamic shape also ensures a flat trajectory and superior energy retention downrange, making it a suitable hunting bullet for cartridges like the 303 British, 7.7mm Arisaka, 7.62x54R, and 7.65mm Mauser. While these rifles may not be associated with modern precision builds, many demonstrate excellent hunting accuracy with this high-performance projectile.

Sierra recommends bore slugging in surplus firearms, as barrel diameters can vary due to wartime production inconsistencies or wear. With a consistent .311-inch diameter, the Sierra 7.7mm 180gr SPT is tailored to safely and accurately function in rifles correctly matched to this bullet size. The bullet’s cannelure and bullet length also promote reliable magazine feeding in both bolt-action and semi-automatic platforms, including those chambered in 7.62x39mm when velocities and magazine configurations permit.

Hunters using traditional service rifles benefit from this bullet’s ability to humanely take down large game at typical engagement distances. Its deep-penetrating jacket and balanced expansion characteristics make it suitable for deer, hogs, and larger animals. The 180gr weight provides strong momentum retention, and when matched to a cartridge delivering 2400 to 2600 fps, the bullet performs with both precision and impact authority.

The Sierra 7.7mm 303 Cal 180gr SPT brings new purpose to classic rifles, enabling them to transition from collector’s pieces to field-proven game takers. For shooters loading surplus-compatible cartridges, this bullet offers modern terminal performance while honoring the historical platforms it was designed to serve.