I took my newly acquired S&W 19-3 out for a test run this morning. It was shooting great at about 10 yds. sometimes hitting the same hole. After about 50 rds., I pushed on the cylinder latch and the cylinder wouldn't open. I can pull the hammer half back and the cylinder will spin freely but, when I try to open it, it only moves about an 1/8". Help! What's wrong? I've got 6 spent shells in the cylinder and can't get it open. I don't want to force anything. Anyone have any ideas?