A week ago, Capt. John McNally of the U.S. Army was in Barcelona, testing the new Olympic pistol range. He may be making a return trip this summer. McNally is a favorite to win one of two Olympic berths on the U.S. shooting team's roster in rapid-fire pistol. The second trials match starts today in Chino, with McNally nine points ahead of Roger Mar of Colorado Springs, Colo. The top eight shooters from the U.S. national team were invited to compete for the two positions.