As some of you have requested (and I promised), here are several images of the Chris Peters-performed ejector star modification to my Ruger GP100; the cuts/terracing is intended to provide somewhat of a repository for unburnt powder granules that are blown back into the ejector area, and preclude the ejector's being unduly forced outward, potentially jamming cylinder movement/revolver operation. Chris called it his "Plus P Powder Eater" modification, as he perceived the problems being more prevalent with .38 Special .38 Special +P ammunition. It seems to work nicely; I've never had my GP100 operation hindered by any GSR/ejector star issues.
Chris performed the mod as part of the custom work that he performed on my GP, but he was also offering it as a stand-alone option as part of his custom gunsmithing menu of services.
Best, Jon