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Backcountry Protection with Winchester Big Bore Ammo

Pistol ammunition for any situation in hunting and personal defense.

Designed for big bears in bear country, Winchester's Big Bore ammo is a great option for big-game handgun hunting or for personal protection in the backcountry. Available for 10mm Auto, 357 Mag, 44 Rem Mag and 45 Colt guns, this round promises deep penetration, optimized expansion and reliable performance.

Big Bore centerfire pistol offerings feature a newly engineered semi-jacketed, concave hollow point that controls and delays expansion to achieve massive shock and lethal wound channels. Available in the pistol calibers popularly carried in the backcountry, Big Bore was designed to offer consistent expansion, massive energy deposit and most importantly, trusted functioning. This is ideal ammunition for hunting and personal defense applications.

Winchester's Big Bore ammo
Winchester Big Bore: Backcountry Bear Protection

Big Bore Ammunition Features

  • Available in 10 mm Automatic, .357 Magnum, .44 Rem Mag, and .45 Colt
  • Reliable expansion on big game and for personal defense situations
  • Newly engineered concave hollow point
  • Deep penetration of semi-jacketed hollow point design controls expansion

Learn more about Big Bore in the attached video with Winchester's Nathan Robinson and Game & Fish Editorial Director Adam Heggenstaller at SHOT Show 2023 in Las Vegas. Learn more:

Cartridge: 10mm Automatic

  • Bullet Weight: 200 Grain
  • Bullet Type: Jacketed Soft Point
  • Muzzle Velocity: 1175
  • Muzzle Energy: 613
  • Rounds Per Box: 20

Cartridge: 357 Magnum

  • Bullet Weight: 157 Grain
  • Bullet Type: Jacketed Soft Point
  • Muzzle Velocity: 1460
  • Muzzle Energy: 748
  • Rounds Per Box: 20

Cartridge: 44 Remington Magnum

  • Bullet Weight: 240 Grain
  • Bullet Type: Jacketed Soft Point
  • Muzzle Velocity: 1485
  • Muzzle Energy: 1175
  • Rounds Per Box: 20

Cartridge: 45 Colt

  • Bullet Weight: 250 Grain
  • Bullet Type: Jacketed Soft Point
  • Muzzle Velocity: 900
  • Muzzle Energy: 450
  • Rounds per Box: 20

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