roundball and vc have the best advise,,High Pressure Air! a local auto repair will help ya.(Mills Fleet?)(be prepaired to be humble!)(put oil like heck down the bore first to lube the paper and make a seal!)
Idaho Rons' idea of the co2 might work for ya,,but those things usually need a good tight seal made by a 'dry-balledl' patch-n-ball combo too work well and don't have the "volume" of air you may need.
luck too ya,,it might take a few days too dry the wet paper,,but you can "shoot it" out!! too.