223 seems to do the trick. Even with FMJ, the temporal cavity seems to encompass about 1/5 of an armadillo.
I've shot them with 12 GA steel 4 shot, and 9mm too. Never seems to be a problem with any of those calibers.
I've shot them with 12 GA steel 4 shot, and 9mm too. Never seems to be a problem with any of those calibers.