Probably you should call the company that sells them and ask what they think, because different brands of gloves do fit differently.
Other than that, you might want to go to some store that sells general purpose gloves and try some on. I find that a size medium general purpose glove fits a little tight on my hand, so I would probably buy a large. I can get the medium on, but it fits a little tight, but that is how I want a new shooting glove to fit, so I would buy a medium in a shooting glove.