No there aren't, that is why their party's platform remains eternally unchanged on abortion, libertarianism supports zero restrictions on abortion, just like the homosexual agenda and their desire to remove the Border Patrol and INS, and truly open the borders.
Reagan was no libertarian of course, with his strong military views and anti-gambling/prostitution examples in that interview, he did that even though he really was searching to win over that small libertarian group, that lonely little interview of almost 40 years ago, during a campaign. Even there, while speaking to them in a fatherly manner as to children, he distances himself from them.
You are right that conservatives and libertarians share economic views, that is why liberals who share economics with conservatives, had to come up with a new way to describe themselves to avoid merely being liberals, they call themselves "libertarians".
Sure there are, they just aren’t a majority. And as I said, their position is more consistent with libertarian principle than what’s in the platform.
The open borders position is coherent as long as it’s accompanied by a complete dismantling of the welfare state. This dismantling of the welfare state is in their platform, btw, and shows pretty clearly that libertarians are worlds apart from liberals. Or are we just supposed to ignore this little detail?