Unless you have a fancy monitor, it can't even display the Adobe RGB color space, so you're fooling around with colors you can't see. Almost all labs print from sRGB. Phone yours and see what they say. If you are using an inkjet printer to make your prints, you might be able to get something extra out of Adobe RGB, but if you are getting Lightjet, or similar prints from a lab, it's going to be printed from sRGB.