I always help paste/reset, and grab a few pieces of brass on my way to/from. I make sure to pickup what I shot on that stage. If at the end of a stage there is some leftover and other shooters don't want it I'll run through and grab some more. However I never do any of it in a manner that will delay "the game".
This method allows me to not only to do my part, but also allows me to "fill my pockets" at the same time. Seems like a win-win for me and my squad.