Greg,
I have some end mills with right hand cut, left hand helix flutes.
They look real strange but do prevent the work being pulled into the
cutter. It's best to use them with the end clear so the chips have
somewhere to go. If milling a step and taking much of a cut the chips
are forced back into the cut and a poor finish can result.

No kidding? I learn something new every day. It makes wading through the
cesspit of Usenet worthwhile.

-G