Didn't bring it up first. Just inserted the video after it the 0.50 caliber round was mentioned likely as sarcasm. I find the video interesting. I disagree with your opinion about the deer in the video dying from a heart attack. Maybe you should view it before posting an opinion about the results.
I am not advocating a .50 BMG or head shots for deer hunting.
To the OP, a .30-06 is your best bet.