Cdn Driver,
Here is the tech brochure, with detailed weights and performance. I believe the delivered offshore birds weigh about 450 lbs more than the brochure, due to additional optional equipment and gear. Good idea to add that much tp the SAR to be conservative.
http://www.sikorsky.com/file/popup/0,3038,827,00.pdf
Page 12 has a good SAR radius chart, about 370 NM radius of action.