Federal introduced the Expanding-Full Metal Jacket a few years back, and those rounds have been fairly well received. More recently, the company introduced the Guard Dog line of personal defense ammunition, which uses similar technology.
The design concept is to achieve an expanding bullet without using a traditional hollow point. In some pistols, a hollow point bullet design doesn’t reliably feed. Even more people run into the problem of hollow point ammunition not being legal in some places (like the entire state of New Jersey). Another problem with traditional hollow points is that material can plug the hollow point and prevent expansion.
The Federal Guard Dog ammunition uses a polymer core and a full metal jacket. When the nose of the bullet strikes the target, the polymer core “gives way” and the bullet flattens. As the bullet flattens, it expands, creating a larger wound channel, which will hopefully incapacitate an attacker more quickly.
In this video, Aaron caught up with the folks at Federal for a run down on the ammo loads and a look at how the bullet expands.