Sierra Pro-Hunter 303 Caliber 7.7mm Japanese 150 Grain Spitzer Bullets - Box of 100

The Sierra Pro-Hunter 303 Caliber 7.7mm Japanese 150 Grain Spitzer Bullets are purpose-built rifle bullets for reloaders working with classic military and surplus firearms. This box of 100 bullets delivers the versatility needed to breathe new accuracy and hunting capability into rifles like the Japanese Arisaka, British Lee-Enfield, and other .311-inch bore service cartridges that have found their way into American gun safes as war trophies and military surplus imports. Whether you're restoring an heirloom rifle or developing accurate loads for hunting, these Sierra projectiles transform often-overlooked vintage calibers into reliable big game performers.

Sierra's 150-grain Pro-Hunter design combines a Spitzer profile with their signature double-taper heavy jacket. The boat-tail Spitzer shape delivers a flatter trajectory and retains energy downrange, while the jacket construction provides deep penetration paired with reliable expansion on medium and large game. The profiled ogive ensures positive feed characteristics even in semi-automatic rifles, so reloaders working with 7.62x39mm platform rifles get the same dependable performance. Before loading, slugging your bore is a smart practice—wartime production tolerances and variable rifle pedigrees mean bore diameters can vary, and confirming you're using the correct .311-inch diameter ensures maximum accuracy and safety.

These bullets are equally at home in the 7.7mm Arisaka, 303 British, or 7.65mm Mauser, making them a practical choice for anyone consolidating a diverse collection of surplus rifles under one reloading program. Sierra's reputation for consistency means each round you assemble benefits from quality control standards that older military ammunition cannot match.

Key Features

• 150-grain weight optimized for .311-inch bore service cartridges
• Spitzer profile for flat trajectory and excellent downrange energy retention
• Double-taper heavy jacket for deep penetration and controlled expansion
• Profiled ogive design ensures reliable feeding in semi-automatic rifles
• Box of 100 bullets for consistent reloading batches
• Suitable for 303 British, 7.7mm Arisaka, 7.65mm Mauser, and similar .311-inch cartridges

Specifications

Frequently Asked Questions

What rifles can I use these 303 / 7.7mm bullets in?

Sierra Pro-Hunter 150-grain bullets are designed for .311-inch bore rifles including the Japanese Arisaka, British Lee-Enfield, 7.65mm Mauser, and other service cartridges of that bore diameter. We strongly recommend slugging your bore before loading—wartime production tolerances mean bore diameters can vary between individual rifles, and confirming .311-inch diameter ensures safe, accurate performance.

Will these bullets feed reliably in semi-automatic rifles?

Yes. Sierra's profiled ogive point shape is specifically designed to provide flawless feeding in semi-automatic rifles, including those chambered in 7.62x39mm and other similar platforms that use .311-inch diameter projectiles.

What performance should I expect on big game?

The 150-grain Spitzer profile delivers a flat trajectory and excellent downrange energy retention. The double-taper heavy jacket provides deep penetration combined with reliable expansion on medium and large game, making these bullets well-suited for hunting applications in vintage military calibers.

How many bullets are in a box?

Each box contains 100 Sierra Pro-Hunter bullets, allowing you to assemble consistent ammunition batches for testing loads and hunting.