223 is a magnum Lion rifle.
63g Sierra semi point
64g Winchester
approximately 25-26.5g of Varget and cci 450, call it good!
If they are still breathing when they hit the ground, hit'em again, straight through the lungs.
If their tail is slapping the ground, hit'em again
If their tail is quivering, you are probably good.
Don't be too quick to run up and see if they are dead.
I killed one with a Ruger single six with a 22 Mag cylinder one handed with mule reins in the other hand, shot him off a rock with six hounds on him as soon as he hit the ground. I had to shoot him quick as he was about to jump off in the middle of the hounds. It was all I could do to keep the mule from jumping in the freecus boxing with his two front feet.