I don't use the index finger lineup trick because my finger is too busy helping me keep a grip on the mag. Never a problem with double-stack mags.
Like the others, I use the off-side, bullets-forward mag carry. I also consistently train to use the front mag first, the back mag second. Training for such *awareness* would *increase* my chances of going for the specialty-ammo magazine should I be so equipped and evaluate such a need.
Now, if you are grabbing the mag with your palm inward and your thumb along the "spine," I can see how your bullets-back approach would work. You would "thumbs-up" the mag to the pistol...right??
[This message has been edited by Cheapo (edited November 03, 2000).]