Nilgai is what your thinking of. They are native to India, but I dont think there is much hunting there anymore!
Do a web search on Nilgai hunts. You will find several places in Texas and one in Mexico that takes bowhunters. They are supposed to be a real challenge to take with a bow. Ugly looking blue-grey critters with lil-spikey horns 8-10 inches long, they must go 300-400 pounds for a good bull. Gene Wensel was pretty high on them a while back, he said they were a real challenge to hunt.
They have some interesting biology and habits, one is that they make "dung heaps" where everybody craps on the same pile, I've never read why this is so. I think they are mostly hunted by stalking or on water, they say they cannot be baited (and if they are in Texas I'm sure somebody tried!) and Gene says they have absolutely zero curiosity.
Interesting critters, but look like an UGLY mount!
Ryan