For those that are interested, here is a photo of the set-up I use to load the RMC brass cases.
To give you an idea of how heavy they are, a Magtech brass case, the ones with a large rifle primer pocket weigh about 325 grains, whilst these RMC cases weigh 790 grains and use a 209 shotgun primer. I bought the nice little brass loading kit RMC sells when I had the cases made, so I use it to knock out the old primers and seat new ones, then this die comes into play.
In the front of the photo, you can see a small ring, next to the shellholder, this is what RCBS has to size the cases, it screws into the bottom of the die, might be fine of Magtech cases, but no good for these ones, so it is unscrewed and put back in the box, to the right of the die body is a sizing bush. The RCBS dies act a bit like a bushing type sizing die, so I ran with that concept. I had the bush made so that it just sizes the first 3/4" or so of the brass case, just enough to hold a projectile, the next bush is made from an old barrel, and is used to very slightly flare the case mouth, and it doesn't take or need much to work, it has I think about a 1 degree taper to it.
The third bush is a seating bush, it just fits over the nose of the CBE Paradox bullet and rests against the shoulder on the bullet, I use it to squarely seat the bullets in the cases, then swapping over to the RCBS crimp bush that came in the set, it just barely removes the taper put on the case and adds a little extra bullet seating tension. A quick wipe over and we're ready to shoot.
This took a little bit of thinking over, but I'm happy with how it all works, a while on a lathe and you've got all the bits you need.

Regards,
David.