It looks to me like they still hump those shells, which I guess, in an extreme combat situation where you don’t have a nice little machine that helps out in some way (I don’t even know if they have those or not) you would have to revert to.
Is it as nut crunching as it seemed from the video (relatively high fire rate, it seemed)?
I don't specifically remember the rate of fire but probable 5-6 rounds per minute.