12 FH
Eds FH was the result of genius and I love it.
The only problems I have is that on mine, I had to make a longer firing pin and put stronger spring in to fire the BMG primers, and had to thread the cases and make the rims. Making the rims was a nightmare.
The DDR uses the same BMG case blown out but 209 primers and you don't have to make the rims.
Just like the FH, you can trim them to any length to use in FH, 3.5 or 3" chambers.
The downside is you can't use the rim to re size but ED re sizes without using the rims on the FH anyway.