Fiocchi Performance Shooting Dynamics Rimfire Ammunition is made with a high-quality design to ensure you receive the best bullets. They are made with hollow points and copper plating. This makes these rounds ideal for those who like to hunt target shoot or competitive shoot. They are designed to be noncorrosive and brass encased and only weigh 38 grains. Some variations include full metal jacket jacketed soft points and jacketed hollow points. These rounds are often a favorite of hunters working the field.