Winchester Defender 5.56x45mm NATO ammunition delivers serious terminal performance in a round built for modern sporting rifles and personal defense applications. Each round pairs a 64-grain bonded jacketed hollow point with Winchester's proven construction to balance expansion, weight retention, and penetration—the three pillars of reliable defensive performance when it matters most.
The bonded construction keeps the jacket and core together through impact, maximizing weight retention so the bullet penetrates consistently rather than fragmenting or shedding velocity prematurely. The tapered copper alloy jacket is engineered to initiate controlled expansion on contact, while the extruded solid base ensures a heavy, deep-driving core. This design philosophy means you get reliable performance across a range of intermediate barriers and distances, not just best-case scenarios at the range.
Practical features round out the package: the bullet profile feeds reliably in AR-platform rifles and other modern sporting rifles, and the reduced-flash powder load keeps muzzle signature low in low-light defensive situations. Each box contains 20 rounds, making it easy to maintain a supply for training or duty use.
| Caliber | 5.56x45mm NATO |
| Bullet Weight | 64 Grains |
| Bullet Type | Bonded Jacketed Hollow Point |
| Rounds Per Box | 20 |
| Brand | Winchester |
Yes. The bullet profile is specifically designed for reliable feeding in modern sporting rifles, including AR-15s and other AR-platform rifles chambered in 5.56 NATO.
In bonded ammunition, the jacket is metallurgically bonded to the core, so they stay together through impact. This prevents jacket/core separation and fragmentation, ensuring more consistent weight retention and deeper, more reliable penetration than traditional hollow points.
Yes. Defender rounds are engineered for personal defense performance, but the reliable feeding and consistent ballistics make them suitable for both training and duty applications in AR-platform rifles.
Each box contains 20 rounds.
Ammunition Restrictions:
You must be 18 years or older to purchase shotgun or rifle ammunition, and 21 years or older for handgun ammunition. All ammunition must be shipped via Domestic Ground, and shipping is not available for international residents. Residents of CA, DC, IL, MA, NY, CT, and NJ may be subject to additional restrictions. Always ensure you use the appropriate ammunition for your firearms, and check your state and local laws for any other relevant regulations on firearms and ammunition. Due to Department of Transportation regulations, returns on ammo cannot be accepted. Please verify local laws before placing an order.
We are unable to ship ammunition to the following:
Illinois residents must provide a copy of a valid FOID Card or Valid Concealed Carry License, along with their IL driver’s license or IL state identification card to purchase ammunition. The ammunition can only be shipped to an address listed on either of those two documents.
Email: [email protected]
Winchester
Winchester
Winchester
