The H&N .177 Cal HP Slug is an airgun pellet that distinguishes itself from other pellets because of its bullet shape. It is designed to be used with powerful rifles that can accurately shoot targets at distances up to 50, 100, or even 200 meters away. The slug has an exceptional ballistic coefficient (BC) which helps it maintain a flat trajectory and retain energy well. H&N offers the slug in three different weight options to accommodate different power levels. For optimal results, they recommend using a rifle with a muzzle energy of at least 16 joules, although 30 joules would be ideal (depending on the weight of the slug and the rifle being used).