Thanks for all the replies.
So what does everyone use...4-shell or 6-shell holders? I was steered away from the 6s because of the difficulty of just grabbing 4 under pressure. I like the idea of more shells, but I'm probably weakest with shotgun reloading, so I didn't want to make it harder on myself.
What's the consensus? Obviously I need to figure out what works for me, but would 4X 6-shell holders a good place to start?