A non lead projectile, this bullet features a hollowpoint flatbased (HPFB) design. This bullet was originally designed for 1:12 twist rate .223s, 22-250 and 5.7. This bullet is designed to delay less than the 55gr, before expanding, but still gets enough penetration and does more than enough damage to use on whitetail and hog. It is perfect for predator hunting. This .223 39gr weight was specifically designed for varmint hunting but we like to kill bigger game just to prove our technology is capable. We suggest the 55gr for game 300lbs and under, and under 300 yard shots. Please read our FAQ section before ordering.