Welcome to the World of Double DGR's. I have found the fastest way to reload is to hold the cartridges between the fingers of my left hand ( I am right handed). After fireing, Open the rifle by dropping the butt, holding the rifle in your left hand. The new shells are between your fingers in plain view in front of you. Remove the shells from you fingers and insert into the chambers.

My PH in Tanzania who uses a Krieghoff 500 NE as a back up showed me the method. I find droping the butt serves two purposes. One, the rifle opens easier. Two, your eyes are always looking in the direction of whatever you have pissed off while reloading. If you drop the barrel, your eyes tend to look down. Not a good Idea in the long grass

Hope this helps.