How do bonded bullets perform in varying altitudes?

Expansion Performance at Altitude

Bonded bullets, particularly those made with copper or bronze jackets, maintain their structural integrity and expansion characteristics across different altitudes. This is because the bonding process between the jacket and core prevents separation, ensuring consistent performance. For example, a 6.5 Creedmoor bonded bullet with a 140-grain core and a .308-inch diameter will expand to approximately 0.60 inches in diameter at 1,000 yards even at high altitudes.

Penetration at Altitude

The penetration of bonded bullets is also less affected by altitude due to their consistent expansion and lack of core-jacket separation. This results in deeper penetration and a higher probability of hitting critical vital organs. In an elk hunt, for instance, a bonded bullet with a 180-grain core will likely penetrate approximately 18-20 inches at 300 yards and 12-14 inches at 1,000 yards, regardless of the altitude.

Ballistic Drop at Altitude

The ballistic drop of bonded bullets is affected by altitude, but to a lesser extent than non-bonded bullets. This is because bonded bullets tend to maintain their weight and aerodynamic characteristics across different altitudes. In a hunting scenario, a bonded bullet with a ballistic coefficient of 0.60 will drop approximately 12 inches at 300 yards and 30 inches at 1,000 yards when fired from a rifle at sea level, but this drop will be less pronounced at higher altitudes.