Barnes Varmint Grenade Bullets 22 Caliber (224 Diameter) 36 Grain Hollow Point Lead-Free (100pk)Varmint Grenade bullets feature a frangible copper tin composite core. They are accurate bullets that can be driven at the highest velocities without coming apart, yet fragments explosively upon impact. Based on a design developed for military applications, Barnes realized that these bullets were perfect for squirrels and prairie dog hunting, but that they also were ideal for larger animals because they created little or no exit wound leaving the pelt