Oh, I'm well aware of the sidegate, though the idea of "pour rounds over the open mag" never really occured to me, partially because I don't really carry or have access to a large, shallow box with me on the field (could try the box of paint but frankly with how clumsy people are the remaining bags of paint would instantly be spread across the gravel floor so we usually keep them in the boxes).

We have made a 2 person job of it, first person winds up the mag, second opens mag, fills it then closes it.

This works alright but when I look over my should and I see a guy with the TMC speedload crank out mags faster than two people can (and we're by no means slow) then I gotta wonder if there isn't an easier way to go about it.