Chowrasia, who won two co-sanctioned titles on European and Asian Tours, moved to nine-under 207 for 54 holes.
Shiv Kapur (68) also moved to tied 33rd at six-under 210.
Chowrasia had three birdies on either side of the course and no bogeys. So far he has had 14 birdies, three bogeys and one double bogey.
Meanwhile, Hennie Otto of South Africa pulled two strokes ahead after three rounds. Otto posted a one under 71 to move to 16-under and into two shot lead over Scotland's Richie Ramsay in second spot.
Gallacher cared a three under 69 to move to ten under and will have to get past Bernd Wiesberger (-13), Ross Fisher and Lee Slattery (both-11) if he is to turn his Ryder Cup dream into reality.
