M14 Shooter
The Light of Truth
Most people - and this includes my 12-yr old son - can change a mag in less time that it takes most people to realize that he's changing a mag.Anyone with two brain cells would know that it would take longer to load 6 magazines instead of three. You should ask someone with said common sense.
Actually, the higher capacity magazines are far more prone to jamming than 10 and 20 round mags. 100 round drums are notoriously unreliable, as the guy in Colorado learned first hand.
So, if the goal is to get 100 rounds fired as fast as possible, I'll take five 20 round mags over a 100 round drum every time. Besides, if you know what you're doing, it only takes a fraction of a second to change a magazine.