Varmint X is designed specifically for the demands of predator and varmint hunters. The sleek polymer-tipped bullets are explosive upon impact. Varmint X combines the proven dependability Winchester is known for with today’s latest technology providing hunters the ammunition of choice for pursuing everything from prairie dogs to coyotes. – Caliber: 223 Remington – Bullet Weight: 40 gr – Bullet Type: Polymer Tip Rapid Expansion – Muzzle Energy: 1151 ft / lbs – Muzzle Velocity: 3600 fps – Rounds Per Box: 20