What I've heard is that the Creedmoor bullets impact causing a temporary and permanent damage cavity. Then, they discharge a subtle fuel-air-explosive gas behind that has a delayed-ignition characteristic and then re-explodes the unwitting ungulate victim, just when it thinks it might possibly survive. It's not just the physical injury that debilitates the animal, but the psychological injury of the unexpected secondary explosive. Thus, the Creedmoor is not just a conventional ballistic weapon, but a double-ballistic weapon, with a tertiary psychological warfare component.
If we can get that info out to the animals before the season starts, we should be able to just walk out to the woods, hold up a round of 6.5 Creedelymore and announce to the critters we are coming to get them.
That " psychological injury" you so rightly mentioned can be put to good use in these times of ammo and component shortages. No need to waste a round, once trained the deers will flop over dead upon hearing our opening morning announcement.
Those that don't die immediately will likely be so psychologically traumatized as to stand there so one could knife stick them in the jugular, again saving ammo for the coming appocolypse.
If necessary, we can put out some video screens in our local hunting spots to show that youtube vid to the local cervid population in the pre-season cud chewing hours. Tactical reinforcement of the " psychological injury" aspect. Kind of like WWII pamphlet dropping.