I assume your SS has a fixed notch rear site milled into the top strap with a thin blade front site. Aside from shooting left of POA how well does it group? Don't take this the wrong way but have you ruled out shooter error? Are you shooting from a rest or off hand? Are you right handed but left eye dominant? Has another individual shot your gun with the same results?
Okay if the shooter has been ruled out and your groups are otherwise good you can make adjustments to the gun. Possible fixes include but may not be limited to the following. 1) If you are off by only a little bit you might try bending the front site blade slightly to the right. 2) If you don't want to do that or need more adjustment have a gun smith turn your barrel.