A deer wounded with a 270 is just as wounded as one that was hit with a 223,243,260,25-06, 30-06, 300 mag, 375 mag.
If you can't make a good lethal shot, the caliber don't matter.
It all about ethics, I feel.
I don't feel unethical taking a deer with a 223, if I want to, but that does not mean its right by the law.
Clayman