You're getting too far ahead of yourself, focus on your 25m target first. Getting through OSUT. They aren't going to send you to any schools until you have some time at the unit and have proved yourself.
That said, there is a Scout/Sniper school in Little Rock, Arkansas. It is a terrific school run by former Marine, Ranger, SOTIC, and regular Army snipers. They managed to take all the good stuff from Bragg, Quantico, and Benning and turn it into one hell of a sniper course. Sometimes they run a 2 week course which is grueling and sometimes a 3 week course. As of 2001, anyone that graduates is awarded the B4 ASI just as if you had gone to through the course at Benning.