Winchester Silvertip Centerfire .223 Rem 64 Grain Defense Tip NPJ Rifle Ammo 20 Round. Specifications for Winchester Silvertip Centerfire .223 Rem 64 Grain Defense Tip NPJ Rifle Ammunition: Manufacturer: Winchester Caliber: .223 Remington Number of Rounds: 20 Bullet Type: Jacketed Soft Point (JSP) Bullet Weight: 64 grain Cartridge Case Material: Nickel Plated Brass Muzzle Velocity: 2700 ft/s Muzzle Energy: 1036 ft-lbs Application: Personal Defense Self-Defense Package Type: Box Primer Style: Centerfire Lead Free: No Gun Type: Rifle Features of Winchester Silvertip Centerfire .223 Rem 64 Grain Defense Tip NPJ Rifle Ammunition Defense Tip: Large diameter polymer tip accelerates expansion resulting in massive stopping power for defense situations Alloyed Lead Core: Optimizes energy transfer and consistent penetration Nickel-Plated Jacket: Provides corrosion resistance and reliable feeding in a variety of firearm types Package Contents: Winchester Silvertip Centerfire .223 Rem 64 Grain Defense Tip NPJ Rifle Ammunition What is Winchester Silvertip Centerfire .223 Rem 64 Grain Defense Tip NPJ Rifle Ammunition good for? The manufacturer thinks that it is best for self-defense personal defense.Winchester Win Ammo Silvertip .223 Rem. 64gr. Defense Tip 20-pack