Fiocchi Magnum Shooting Dynamics Rimfire Ammunition provides consistent, high-quality rounds for the serious hunter or shooter. They are loaded with grain weights that are similar to that found in the Exacta Line. The ammo is ideal for practicing and training, as it can be had at a more reasonable price for high quantities. The rounds are noncorrosive and new production, allowing you the chance to spend more time enjoying your firearm. They are made with a full metal jacket, weigh 40 grains, and have brass casings.