The Winchester Varmint X .223 Remington 55-grain Polymer Tip Brass 20-round box is a specialized centerfire rifle cartridge engineered specifically for coyote hunting, predator control, and long-range varmint management. A primary limitation when targeting thin-skinned varmints with standard full metal jacket or heavy hunting bullets is overpenetration, which results in delayed energy transfer, poor terminal shock, and unrecovered game. Winchester resolves this challenge through the Varmint X bullet architecture, combining a polymer tip with a thin copper jacket and alloy lead core to deliver instantaneous fragmenting expansion, massive hydraulic shock, and total energy transfer upon initial impact.
The core technical advantage relies on Winchester's high-efficiency polymer tip design. Built with a sleek aerodynamic profile, the polymer tip resists deformation during magazine loading and chambering while significantly enhancing downrange flight stability. Upon contact with thin-skinned targets, the polymer tip is driven backward into the lead core, creating immediate hydraulic pressure that causes the thin jacket to rupture rapidly. This explosive fragmenting action maximizes tissue disruption and dump-on-impact kinetic energy while preventing exit wounds and minimizing pass-through risks.
Launching its 55-grain polymer-tipped bullet at a high-velocity 3,240 FPS muzzle velocity (generating 1,282 ft-lbs of muzzle energy), this loading produces a flat trajectory and excellent wind resistance at extended varmint ranges. Assembled using premium reloadable brass cases, clean-burning propellants, and dependable non-corrosive Boxer primers, the cartridge ensures consistent ignition pressures, tight shot groupings, and reliable feeding across AR-15 sporting rifles, bolt-action predator setups, and single-shot platforms.
Key Benefits
- Explosive Polymer Tip: Drives rearward on impact to trigger instantaneous fragmentation and severe energy transfer.
- Thin Copper Jacket: Engineered specifically for rapid disintegration on light-bodied game to prevent overpenetration.
- Flat 3,240 FPS Trajectory: High velocity minimizes holdover and simplifies shot placement on small target profiles.
- Clean-Burning Powder & Brass: Reloadable brass cases and clean propellants deliver reliable cycling and uniform pressures.
Technical Specification
- Caliber: .223 Remington
- Ballistics: 3,240 FPS Muzzle Velocity | 1,282 Ft-Lbs Muzzle Energy
- Projectile: 55 Grain | Varmint X Polymer Tip | Thin Copper Jacket | Fragmenting Lead Alloy Core
- Case/Primer: Precision-Drawn Reloadable Virgin Brass | Clean-Burning Powder | Non-Corrosive Boxer Primed
- Logistics: 20 Rounds Per Box | Winchester Varmint X Series
- Dimensions: Standard .223 Rem Geometry | SKU: X223P
- Application: Predator Hunting, Coyote Control, Fox, Bobcat, Varmint Management, and Long-Range Target Practice
- Standards: SAAMI Compliant | Winchester Quality Control Standards
If you're running a .223 platform for predator control and need consistent terminal performance without overpenetration, this load solves the expansion gap left by FMJ rounds. Get repeatable results backed by controlled manufacturing standards—available now from SMKW, a trusted source for field-proven ammunition.
