Winchester S556PDB Defender 5.56 NATO 64gr Bonded 20rd Box

The Winchester S556PDB Defender ammunition delivers controlled expansion and deep penetration through bonded bullet technology specifically engineered for 5.56x45mm NATO platforms. This 64-grain bonded solid base design maintains structural integrity upon impact while providing consistent terminal performance across various barrel lengths.

What Makes This Different

The bonded solid base construction prevents jacket separation during expansion, ensuring weight retention exceeds 95% even through intermediate barriers. Unlike standard FMJ or hollow point designs, the Defender series uses a proprietary bonding process that welds the lead core to the copper jacket at the molecular level. This technology produces predictable expansion patterns while maintaining sufficient penetration depth for defensive applications.

Key Features

• 64-grain bonded solid base bullet with controlled expansion design
• Nickel-plated brass cases for reliable feeding and extraction
• Flash-suppressed powder reduces muzzle signature in low-light conditions
• Consistent 2,750 fps muzzle velocity from 16-inch barrels
• Temperature-stable propellant performs reliably from -20°F to 140°F
• Crimped and sealed primer pockets prevent moisture intrusion
• Compatible with all 5.56 NATO and .223 Remington chamber specifications

Field testing demonstrates consistent 1.5-2.0 MOA accuracy from quality rifle platforms, making this ammunition suitable for both defensive applications and precision training. The bonded construction maintains terminal effectiveness through automotive glass, drywall, and light cover materials while reducing over-penetration risks in urban environments. Law enforcement agencies report reliable function across AR-15 platforms with various barrel lengths and gas system configurations.

Technical Specs

• Caliber: 5.56x45mm NATO
• Bullet Weight: 64 grains
• Bullet Type: Bonded solid base
• Muzzle Velocity: 2,750 fps (16" barrel)
• Muzzle Energy: 1,077 ft-lbs
• Case Material: Nickel-plated brass
• Primer: Non-corrosive Boxer
• Packaging: 20 rounds per box, 10 boxes per case
• Country of Origin: United States

The S556PDB represents Winchester's commitment to defensive ammunition performance through proven bonded bullet technology. Professional users requiring consistent terminal ballistics across varied engagement scenarios will find this load meets departmental specifications while maintaining the accuracy standards expected from Winchester's manufacturing processes.