Have a look at the bottom of this page:
http://www.targetbunny.btik.com/p_Self_Defence.ikml
The last two PDFs are a guide to full bore pistol marksmanship, the techniques covered are perfect for the HW45 as well as the full bore 1911 automatic
You'll be hitting cans every time at 30 yards and more if you practice ;-)
Regards,
Nick