Welll.... I was at Area 1 a couple years ago for the Area 1 3-Gun championship. Rifle stage, requiring around 40 rounds. In my infinite wisdom, 2 30 round magazines should be more than adequate. Moving from the first array to the second, moving my trigger finger out of the trigger guard to the MAGAZINE RELEASE, magazine falls out of the rifle, I attempt to catch it, miss, and a magazine with 24 rounds falls to the ground and EXPLODES! The base plate pops off the magazine and the spring shoots 24 .556 rounds all over the ground. My brain screams to me at this point that my second 30 round magazine won't be enough to finish the stage. I press on, shoot my 30 rounds to a slide lock, and leave 4 steel targets Failure to Engage and 4 Misses.
I always carry all the magazines I think I'll need, plus one more. JPF