Last reviewed: 2026-04-18 by Jake Terry, FFL07/SOT3, NRA-certified firearms instructor.
The Hornady Black 308 Winchester 155-grain A-Max polymer tip load bridges mid-weight precision and supersonic energy retention. Built on Hornady’s versatile Black platform, this cartridge feeds reliably across direct impingement AR-10 gas systems, gas-piston semi-autos, and bolt-action rifles with equal consistency. The 155-grain A-Max projectile features a secant ogive profile and polymer tip designed to resist deformation during magazine feeding while initiating consistent expansion upon impact. At 2850 feet per second from a 24-inch test barrel, muzzle energy reaches 2795 foot-pounds — a threshold that maintains lethal authority past 400 yards when paired with the load’s 0.435 G1 ballistic coefficient and 0.233 sectional density.
Built for the Box
Hornady engineers optimized this load for mid-length gas systems and suppressed applications, balancing port pressure with cycling reliability. The A-Max polymer tip protects the hollow point cavity from debris during chambering while lowering drag coefficient for flatter trajectory. Brass cases carry Boxer primers; non-corrosive propellant burns clean enough for extended range sessions without fouling gas tubes. Each 20-round box ships DOT-regulated — verify shipping restrictions in your jurisdiction before ordering through Hornady 308 ammunition.
The Numbers
| Spec | Value |
|---|---|
| Caliber | 308 Winchester |
| Bullet weight | 155 Grains |
| Bullet type | Hornady A-Max Polymer Tip |
| Muzzle velocity | 2850 Feet Per Second |
| Muzzle energy | 2795 Foot Pounds |
| G1 Ballistic Coefficient | 0.435 |
| Sectional Density | 0.233 |
| Test Barrel Length | 24 Inches |
| Rounds/box | 20 Round |
| Case | Brass |
| Primer | Boxer |
| Corrosive | No |
| Reloadable | Yes |
| Velocity Rating | Supersonic |
| Intended use | Self Defense |
| Manufacturer | Hornady |
Reloadable brass cases extend cost per round when you handload. Store in a cool, dry environment away from open flames or heat sources exceeding 120°F.
Safe Handling & Compliance
Federal law requires purchasers to be at least 18 years old for rifle 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.
- Observe the four universal firearms safety rules at all times: treat every firearm as loaded, never point at anything you are not willing to destroy, keep your finger off the trigger until ready to fire, and know your target and what lies beyond it.
- Verify current federal, state, and local regulations governing ammunition purchase, possession, and transport in your jurisdiction before ordering.
- This product contains lead, a chemical known to the State of California to cause cancer and reproductive harm — use adequate ventilation during range sessions and wash hands after handling.
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