Last reviewed: 2026-04-19 by Jake Terry, FFL07/SOT3, NRA-certified firearms instructor.
The Winchester Defender 5.56x45mm NATO 64gr bonded jacketed hollow point addresses a specific challenge: achieving reliable expansion and penetration consistency in personal defense loads for modern sporting rifles. Winchester’s bonded core construction welds the jacket to the lead core, preventing separation on impact and maintaining mass as the projectile penetrates barriers. At 2800 fps from the muzzle, the 64-grain bullet delivers 1115 ft-lbs of energy — velocity sufficient to initiate expansion while staying subsonic at defensive ranges. Brass cases and boxer primers allow for reloading. This is defensive ammunition engineered for shooters who require predictable terminal performance from the 5.56 platform in close-quarters scenarios.
Built for the Box
Winchester designed the Defender line around feeding reliability in semi-automatic rifles. The bonded jacketed hollow point profile promotes chambering without rim or ogive hang-ups common with some hollow-point designs. The bonding process chemically fuses jacket to core, so even when the bullet encounters intermediate barriers — drywall, plywood, heavy clothing — the projectile retains structural integrity and resists fragmentation. Supersonic velocity rating at 2800 fps ensures consistent flight and energy transfer within defensive distances. Non-corrosive primer and brass case construction support long-term storage and reloadability.
The Numbers
| Spec | Value |
|---|---|
| Caliber | 5.56x45mm NATO |
| Bullet weight | 64 Grains |
| Bullet type | Bonded Jacketed Hollow Point |
| Muzzle velocity | 2800 Feet Per Second |
| Muzzle energy | 1115 Foot Pounds |
| Rounds/box | 20 Round |
| Case | Brass |
| Primer | Boxer |
| Corrosive | No |
| Intended use | Self Defense |
| Manufacturer | Winchester |
This load fits the Winchester 5.56×45 Ammo roster as a defensive option, differentiating from FMJ training rounds by offering controlled expansion and bonded-core construction. Reloadable brass extends the utility of each case for handloaders who dial in custom defensive 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.
- Observe the four rules of firearm safety at all times when handling firearms or ammunition.
- Verify that ammunition caliber matches firearm chambering before loading. Confirm local and state laws regarding ammunition possession and transport.
- This product contains lead, a chemical known to the State of California to cause cancer and birth defects or other reproductive harm. Wash hands thoroughly after handling. Proposition 65 information.
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