Hornady Bullets 243 Caliber, 6mm (243 Diameter) 87 Grain Hollow Point Boat Tail (100pk)A bullet design which features a hollow cavity at the point. On impact, the bullet is forced to open up and expand, resulting in less penetration but greater damage due to the larger diameter of the now expanded bullet. These are primarily used in hunting applicatons. This is not loaded ammunition. Ballistics Information Sectional Density: 0. 210 Ballistic Coefficient: 0. 376