I've watched my buddy kill 4 deer with them (6mm Creed - same speed as yours), including one very big-bodied MT mulie, and they performed just fine. One-shot kills, most penetrated. Caught one on an MT whitetail at 425 yards under the off-side skin. 60% weight retention - no jacket separation.
AZ trophy Coues at 270 yards - full penetration, DRT.