Do the pros use range balls at tournaments or there game balls
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There's no need really. The ball flights aren't going to change that much between a normal range ball or a top shelf ball. When they're on the range, they're simply warming up and working on striking the ball well and testing the waters. The ProV1x's qualities are only going to come in to play in the short game and putting for the most part. Despite what people think about low-spin balls not slicing or hooking as much, the numbers actually don't change that much.
They get balls of their choice.
There are bags of ProV1, ProV1X, Callaway, Srixon, Nike, whatever - all available to them
They ONLY hit the balls they use in tournaments.
Check out this Back Stage Pass segment on a PGA Tour event. Slide 10 shows you that the practice range offers big-name balls to the players. http://www.golf.com/photos/behind-scenes-pga-tour-event/range-balls#320952