The short sight base of the snubnose revolver makes it very hard to aim. Also, the sights are fairly rudimentary. There is a groove on top of the top frame. You need to almost aim like you would a shotgun. Aim down the groove, along the top of the barrel, to control your elevation. Use your front sight blade to control your windage. Be patient. You'll catch on.
You should use a full-size silhouette target when you first start this. Don't use one of the small targets. Also, I seem to do better at 15 feet than at 10 using the iron sights on the snubby.
That, by the way, is one of the best reasons to put a laser on the snubby. It gets MUCH easier to point the gun, and practice "point and shoot" at short ranges once you have installed and zeroed the laser grip...
THere is also a good thread to read here:
Snubnose shooting tipsHowever, disregard the piece on sight picture. The Colt snubby had regular sights. The sights you have are the old police type sights. You have to aiim down the groove and along the top of the barrel LIKE A SHOTGUN. A very, very, very short shotgun