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5.56 NATO - Winchester 55 Grain M193 FMJ (WM193K) - 500 Round case
Caliber: 5.56×45 mm NATO
Bullet Type: Full Metal Jacket (FMJ), M193 specification
Bullet Weight: 55 grains (3.56 g)
Winchester’s M193 5.56 NATO load features a 55 gr FMJ bullet designed for reliable feeding, consistent accuracy, and dependable function in AR-15 and other 5.56 NATO-chambered rifles. Suitable for training, target shooting, and high-volume range use.
Ballistic Data
Muzzle Velocity: ~3,240 fps (988 m/s)
Muzzle Energy: ~1,282 ft·lb (1,738 J)
Typical performance from a 20″ test barrel:
| Range | Velocity (fps) | Energy (ft·lb) | Trajectory Drop* |
|---|---|---|---|
| 0 yd | ~3,240 fps | ~1,282 ft·lb | — |
| 100 yd | ~2,850 fps | ~993 ft·lb | ≈ −1.5″ (−3.8 cm) |
| 300 yd | ~2,400 fps | ~703 ft·lb | ≈ −12.1″ (−30.7 cm) |
*Trajectory drop is approximate, assuming a 100 yd zero. Actual results may vary by rifle and conditions.
Technical Specs
Primer Type: Boxer, non-corrosive
Case: Brass, reloadable
Bullet Construction: Lead core with copper jacket
Winchester SKU: WM193K
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