Double Disk vs Double Stroke
Yes, you can double stroke the auto-disk measure, but this is only practical if you are using the spring return, not the chain (using the chain requires a full stroke-see below).
You have to remember (on turret or progressive presses) to short-stroke the press to avoid having the shell plate or turret advance.
You have to remember to double stroke the press (if you don't, you will have a half charge) and remember NOT to triple stroke it.
Because (with the double disk kit) you can mix different cavities, you can get a more varied selection of charge weights. Double stroking means you are using the same cavity twice which makes it less flexible in charge weight choices.
All in all, double stroking is a poor substitute for a double disk kit. Less convenient, less safe and less flexible.
But you can do it and get satisfactory results.
Lost Sheep