I have used Fiocchi and most recent, Remington STS hulls with Claybuster wads and Alliant 410 powder and Win 209 primers, but recently bought 5K of Wolf 209 primers and they work well. I use a slightly modified shot drop of around 226gr to get the best fill and crimp with the components that I use. I have an adjustable charge bar but didn't like it, and found the factory powder bushings very consistent.
The Mec JR can load 3" with the conversion parts, but it's a pita to get the adjustments right, if you're switching back and forth.
NCsmitty