Last reviewed: 2026-04-18 by Jake Terry, FFL07/SOT3, NRA-certified firearms instructor.
The Winchester M193 5.56x45mm NATO 55 grain full metal jacket delivers the velocity and reliability you need for extended training sessions and target work. At 3180 feet per second from the muzzle, this supersonic load maintains the ballistic profile of the military M193 specification — a 55 grain bullet at velocities that fragment reliably when fired from a 20-inch barrel. For civilian shooters, that means a flat trajectory, minimal wind drift inside 300 yards, and consistent point of impact across multiple magazines. The full metal jacket bullet does not expand on impact, making it ideal for paper, steel, and carbine drills where penetration is secondary to repeatability.
Built for the Box
Each round is assembled in new brass cases with non-corrosive boxer primers, delivering the quality Winchester has staked its reputation on for over a century. Brass cases allow multiple reloads when paired with proper resizing and inspection — a cost-saving measure for shooters running thousands of rounds annually. The 1235 foot-pounds of muzzle energy places this load squarely in the standard-pressure 5.56 NATO envelope, functioning reliably in AR-15 platforms with both carbine- and rifle-length gas systems. This ammunition ships in a 300-round ammo can — sealed, stackable, and ready for long-term storage or transport to the range.
Specs at a Glance
| Spec | Value |
|---|---|
| Caliber | 5.56x45mm NATO |
| Bullet Weight | 55 Grains |
| Bullet Type | Full Metal Jacket |
| Muzzle Velocity | 3180 Feet Per Second |
| Muzzle Energy | 1235 Foot Pounds |
| Rounds per Can | 300 |
| Case | Brass |
| Primer | Boxer |
| Corrosive | No |
| Reloadable | Yes |
| Velocity Rating | Supersonic |
| Intended Use | Range & Target |
| Lead Free | No |
| Country of Origin | United States of America |
| Manufacturer | Winchester |
This load belongs to the broader M193 ammo family — a specification that remains the baseline training standard for AR-15 shooters worldwide.
Who It’s For
If you’re running carbine courses, zeroing optics, or burning through drills that require 200+ rounds per session, this ammo can offers the volume and consistency to keep you on target without breaking the budget. The brass cases hold value for reloaders, and the boxer primers simplify decapping. For shooters in states with lead-exposure concerns, note that this is not a lead-free load — jacketed lead core bullets require proper ventilation and post-range hygiene. The 55 grain weight stabilizes cleanly in barrels with 1:9 or faster twist rates, though 1:7 twist barrels — standard on most modern ARs — will also handle it without issue.
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.
- Treat every firearm as if it is loaded; muzzle in a safe direction at all times.
- Keep your finger off the trigger until ready to fire; verify your target and what lies beyond it.
- This ammunition contains lead — wash hands thoroughly after handling, and use adequate ventilation when shooting indoors. California Proposition 65 warning applies.
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