This maps pretty well to my own experience. I find that the young Republicans in my slice of the Northeast are overwhelmingly social conservatives, for reasons they frequently cannot elucidate. I have encountered few genuine "fiscal conservatives" (that is to say, those who are not "cut everything I don't like, but keep spending on the military!"), and the few I have generally prefer to call themselves libertarians.

I would also note that there are plenty of social regressives/fiscal apathetics who call themselves "libertarian" because it doesn't have the stigma of "Republican".