I killed a rag horn this year using a 51# Stalker Coyote shooting 32” 5mm Easton Axis 300 spine with 100 grain HIT insert, 25 grain ballistic collar and 125 grain broadhead. Shot elk at 14 yards. Shot through ribs on both sides. Arrow just about passed completely thru with about the back 5 inches remaining in the body cavity until the broadhead caught on a limb and pulled that part thru. Elk went 100 yards and laid down for his last time. I have some 340 spine Axis Legacy arrows that tuned about the same. I went with the 300s for the few extra grains of weight.