Not all 9mm bullets will crimp tightly enough.
These will not work
http://www.midwayusa.com/eproductpag...lastID=7620061
Round nose bullets seem to get pushed back on me, but truncated cone varieties will stay firm.
IMHO, any straight sided 9mm bullet will work. I have had the best luck with Hornady XTPs.
I resize .40s to make 357SIG. The neck is a bout 10-15 thousands shorter, but it stretches with firings. Also 40 brass will have a few ftf, until fire formed, so I use it for training ammo.
Yes it does make it a lot cheaper.
Every body leaves once fired .40 at the range.