Description
Nosler took the proven cup-and-core bullet design and elevated it specifically for revolver and lever-gun applications. The ASP .357 Magnum delivers what separates quality ammunition from basic loads: consistency. Each round is assembled with meticulous attention to detail, from precisely weighed powder charges to brass that's checked for proper length, neck-sized, chamfered, and inspected for flash hole alignment.
Skived Jacket Design for Controlled Expansion
The real distinction in these rounds comes from the deep skives cut into the jacket. This isn't just marketing—it's engineered expansion control. Those pre-scored grooves guide the bullet to open predictably across a wide velocity window, from moderate speeds in shorter barrels to full magnum velocities. Nosler engineered the design to expand reliably between 800 and 1,300 fps, which covers pretty much everything you'll encounter in the field or at the range. The result is consistent terminal performance without over-penetration.
Built for Accurate Shot Placement
These loads evolved from Nosler's match-grade ammunition line, and that heritage shows. The 125-grain JHP bullet sits in Nosler headstamped brass with quality components throughout, delivering the kind of accuracy that matters when precision counts. Tight manufacturing tolerances mean bullet weight and ballistic performance stay consistent from round to round.
Ready for Revolver and Lever-Action Carbines
The smooth-feeding bullet profile works reliably in revolvers and modern lever-action rifles. The 20-round box gives you enough rounds to develop loads for your specific gun, or to keep your carry revolver stocked with ammunition you trust. Whether you're building skills at the range, carrying for personal defense, or taking the lever gun on a hunting trip, this load handles the mission.
Key Specifications
- Caliber: .357 Magnum
- Bullet Weight: 125 grains
- Bullet Type: Jacketed Hollow Point (JHP)
- Rounds Per Box: 20
- Cartridge Case: Nosler Headstamped Brass
- Case Type: Reloadable Brass
- Primer: Boxer (non-corrosive)
- Manufacturer: Nosler
- Model: Assured Stopping Power (ASP)
- Manufacturer Part Number: 40134
- UPC: 054041401340
- Cartridge Length: 2.750 inches
- Jacket Material: Gilding Metal (95% copper, 5% zinc)
- Core Material: Pure Lead
- Bullet Design: Skived Hollow Point with truncated cone profile
What’s Included
- 20 rounds of .357 Magnum 125gr JHP ammunition
- Nosler headstamped brass casings
- Boxer primers
Frequently Asked Questions
Will Nosler ASP .357 Magnum ammo work reliably in my revolver?
Yes. The ASP line was specifically designed with smooth-feeding bullet geometry that cycles reliably through revolver cylinders and modern lever-action rifles. The truncated cone profile and quality brass ensure consistent feeding with minimal issues. Many users report excellent reliability across a variety of platforms.
How much expansion should I expect from the Nosler ASP bullet?
The skived jacket design creates controlled, consistent expansion across a wide velocity range, typically between 800 and 1,300 fps. The deep pre-scored grooves guide expansion reliably without over-penetration. In testing, these rounds have shown predictable behavior when fired into ballistic gelatin and other test media.
Is the brass reloadable for handloading?
Yes. Nosler headstamped brass is quality reloadable brass with Boxer primers. Each piece is checked for correct length, neck-sized, chamfered, and flash holes are verified for proper alignment during manufacturing. This makes it suitable for reloading if you want to develop custom loads.
What's the difference between this ASP ammo and standard defensive ammo?
ASP ammunition evolved from Nosler's match-grade ammunition line, meaning it carries that heritage of precision loading and component selection. The deep skives in the jacket, the pure lead core encased in quality gilding metal, and the meticulous assembly process separate it from basic offerings. The result is ammunition that balances accuracy with reliable terminal performance.






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