Winchester Big Bore Line of Personal Defense/Hunting Ammunition

EAST ALTON, IL — In the backcountry, little is left to chance. The trusted performance of Winchester® Big Bore ammunition for hunting and personal defense gives individuals the confidence needed for any situation.

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 ammunition was designed to offer consistent expansion, massive energy deposit and most importantly, trusted functioning. This is ideal ammunition for hunting and personal defense applications.

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
Look for new Big Bore ammunition at a Winchester retailer or dealer near you, and for more information on Winchester Ammunition products visit

About Winchester Ammunition

Winchester is the largest small caliber ammunition enterprise in the world and the leader in delivering innovative ammunition products to hunters, sport shooters, law enforcement and the U.S. Warfighter. The 157-year-old Winchester brand is built on integrity, hard work and a deep focus on its loyal customers. Learn more about Winchester by visiting or connecting with us on Facebook at

Winchester: Committed to Safe, Legal and Responsible Firearm Use

As a global leader in the shooting sports and hunting industry, and a brand of 157 years, Winchester is committed to safe, legal and responsible firearm use. Winchester works with key groups like the National Shooting Sports Foundation on a variety of topics important to our industry, including training and education, and on specific programs such as Gun Owners Care and Project ChildSafe. Winchester will continue to support programs, organizations and individuals who promote hunting and shooting sports activities in a positive and responsible environment. Any use of firearms by youth participants should be done under the direct supervision of a parent, guardian or other responsible adult.

About Gun Owners Care

Gun owners care. You care about safety. You care about preventing unauthorized access to firearms. You care about bettering your community, helping those in need, and conserving wildlife and wild places for generations to come. It’s time for gun owners to tell their stories and to show how they're making a difference. NSSF®, the trade association for the firearms industry, has established the Gun Owners Care campaign to unite gun owners and the firearms industry in this common cause. Visit for more information.