I know exactly what you mean. That's done it for me twice....Maim deer/question my role as a hunter. Once was a mercy shot gone wrong and the second was just a poor shot choice. In either case, a deer got seriously wounded.
It's only good if the deer dies right there and quick.

I would go with the 7 mag and I practice what I preach. My other go to deer gun is a 30-06. Not saying you can't kill deer with less, but why chance it.

David

Proverbs
- A wise man feareth, and departs from evil: but the fool rages, in confidence.
- It is honor for a man to cease from strife: but every fool will meddle.
- Mischief is as sport to a fool: but a man of understanding hath wisdom.