The Swift Zephyr bullet has been in development for a number of years. It's been thoroughly tested for accuracy, terminal performance, and hunted extensively in New Zealand at long distances. It shoots straight, but the most impressive part about the bullet is its terminal performance. From muzzle to 1000 yards, it has controlled expansion, a flat frontal area and high weight retention on impact. It travels perfectly straight in the wound channel. While weight retention varies with velocity and yardage, overall it maintains 88% of its weight. The Zephyr bullet has a tangent/secant hybrid ogive, a heavy jacket and a bonded core. It's a long, heavy bullet and requires a fast twist rate. This is not loaded ammunition.