Angular Contact Bearings and Ballscrews question

Hello

I am starting to look for angular contact bearings to intsall in one
end of the leadscrews for a mill. I seem to recall that the screw is
firmly held at one end, while it can "float" in the other end,
meaning that with expansion due to temperature, one end of the
leadscrews sit in a radial bearing.

So, are there such beasts as double angular contact bearings? Or is
it common practice to buy 2 for each screw, and mount them backwards
to take up thrust forces in both directions? If they are sold in
double row, do they make them small enough for a .631 screw, with a
base diameter of about 0.500"?

Would tapered roller bearings work just as well? Or are they too long
and bulky or something?

If anyone has cnc'd a mill and run into this, could you inform how
you handled the bearings?

Thanks a bunch, Tom.