Sportsman's Guide is your ideal source for .264 Winchester Magnum Ammo. This .264 Win. Mag is a 50-year-old round that is great for long-range performance and accuracy. In-stock and ready to ship at Sportsman's Guide. Check out our .264 Win. Mag. Ballistics Chart for your firing specs. Put your sights on value with this .264 Win. Mag. Ammo at The Guide!