Last reviewed: 2026-04-18 by Jake Terry, FFL07/SOT3, NRA-certified firearms instructor.
Nosler Custom 8x57mm JS Mauser ammo delivers 180 grains of Ballistic Tip projectile at 2600 feet per second—factory-loaded hunting rounds built for bolt-action rifles chambered in the .323″-diameter 8mm Mauser cartridge. The 8x57mm JS Mauser remains a capable hunting round for deer, elk, and black bear at ranges inside 300 yards, provided shooters select bullets that balance penetration with controlled expansion. Nosler’s Ballistic Tip design uses a polycarbonate tip over a lead core and a tapered copper jacket with a heavy base section. The tip initiates expansion on impact while the thick jacket base resists fragmentation, retaining 60-70% of original weight through bone and tissue. You’re loading ammunition that handles field conditions without relying on adjectives: brass cases cut to SAAMI spec, hand-thrown powder charges verified for consistency, and projectiles seated in exact alignment by Nosler ballisticians during small-batch production runs.
Performance at a Glance
The 180-grain Ballistic Tip exits the muzzle at 2600 fps and carries 2702 foot-pounds of energy at the bore. At 100 yards, velocity drops to approximately 2380 fps with 2264 ft-lbs remaining. The G1 ballistic coefficient of 0.394 provides moderate wind drift performance—expect a 10 mph crosswind to push the bullet 1.5 inches at 100 yards and 6.2 inches at 200 yards. Sectional density of 0.247 allows adequate penetration for broadside lung shots on whitetail and mule deer; quartering angles on larger game require careful shot placement to avoid excessive jacket separation. Brass cases are boxer-primed and reloadable, with primer pockets uniformed and flash holes deburred during the manufacturing process. Each 20-round box ships with ballistic data printed on the label for quick reference in the field.
Specs at a Glance
| Spec | Value |
|---|---|
| Caliber | 8x57mm JS Mauser (.323″ diameter) |
| Bullet weight | 180 grains |
| Bullet type | Nosler Ballistic Tip (polymer tip) |
| Muzzle velocity | 2600 fps |
| Muzzle energy | 2702 ft-lbs |
| G1 BC | 0.394 |
| Sectional density | 0.247 |
| Rounds per box | 20 |
| Case | Brass (reloadable) |
| Primer | Boxer, non-corrosive |
| Lead-free | No |
| Intended use | Hunting (medium to large game) |
| Manufacturer | Nosler |
The 8x57mm JS Mauser cartridge operates in rifles with .323″-diameter bores—distinct from the earlier 8x57mm J Mauser, which used a .318″ bore and is no longer common in production firearms. If your rifle headstamps “8×57 JS” or “8mm Mauser” on the barrel, this ammunition is compatible. Most Mauser 98 bolt actions imported after 1905, along with modern sporting rifles chambered in 8mm Mauser, accept .323″ projectiles. Check your rifle’s bore diameter or consult factory specifications before ordering if uncertain. Additional 8mm Mauser ammo options are available for target work, steel-core surplus, and lighter-weight varmint loads.
Safe Handling & Compliance
Federal law requires purchasers to be at least 18 years old for rifle and shotgun ammunition, and at least 21 for handgun ammunition. Ammunition cannot be shipped to certain states, counties, and cities—review our ammunition shipping restrictions before ordering. Store ammunition in a cool, dry location away from heat sources and out of reach of unauthorized users.
- Treat every firearm as if it is loaded. Keep the muzzle pointed in a safe direction at all times.
- Store ammunition in original packaging away from moisture, heat, and incompatible materials. Lead-based projectiles require ventilation during storage per California Prop 65.
- This ammunition is DOT-regulated as ORM-D hazardous material. Ground shipping only—no air transport permitted.
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