There have not been any feral cattle in the Texas border area in years..At one time some of Guspar Penas fighting bulls crossed into the USA in the Marathon Sanderson area, and some ranches sold them for hunting, the other just roped them and dragged them into trailers and penned them until they had enough for a load then off to the sail barn.

I am sure there are a few ranchers would let you shoot " feral cattle ", except during branding season!!