Buzz,
RST & Polywad use Cheddite hulls, made in France and available as new from Graf & Sons. Good hulls, 2.5" in 16 or 12 gauge.
First machine pictured is a 16 MEC with a short kit. For the old guns I load 12, 16 and 20 all with short kits and Cheddite hulls. For the 16 - 2 1/2 inch hull, I use the Gualandi 1618 wad, Remington or Winchester primers, 7/8 oz. lead 7 1/2 shot, Alliant Unique through a #25 bushing which weighs out on an electronic scale to be 15.7 grains for that particular powder. I have used Unique for shotgun & pistol loads for over 55 years and like it's consistency.
MEC has the bushing chart on their website that you can copy. I would advise precise weighing for each bushing, as there are variations based on the powder used
and from bushing to bushing even with the same number....
First machine is the 16 MEC.....
Best,
