Check out this thread --
http://www.thefiringline.com/forums/...d.php?t=372381
FWIW, I carry whenever I legally can. I most often carry a 1911 (usually Commander size). I sometimes will carry an H&K P7M8. I wear the gun in an IWB holster on my strong (right) side at about 3:30. I carry at least one extra magazine, and sometimes two, on my weak (left) side in a single or double (as the case may be) magazine pouch worn OWB at about 8:00.
I carry weak side because I've trained to reach for the fresh magazine with my left hand and drop the old magazine with my right just as my left hand acquires its grip on the fresh magazine. A speed reload in 1 to 2 seconds is doable with training and practice. Carrying a spare magazine in a pocket or some improvised pouch could slow things down quite a bit.