I don't like progressive used that way because historically progressivism was just about an ideology that was results driven and often independent of other labels. There were progressive conservatives like Teddy Roosevelt and the Nelson Rockefeller Republicans in America (though the progressive conservatives in Canada are anything but). They were fundamentally centrist liberals though, essentially a watered down evolution of the historical French radical liberalism/radical whigs. Merkel, for example, called herself a progressive and she was a Christian Democrat.