What James id looking for it someone to cut the freebore area...There have been others who have had issues with the very WIDE nose profile. Seatling slightly deeper is what most have done.
Look at this info at 38Super; http://www.38super.net/Pages/Overall%20Length.html
The same will hold for the 10mm cartridges...
The Freebore area is mostly cut for a Turncated Cone Style, and this can vary from one manufacture to the next. Therefore finding someone with a reamer to cut for the fit the WFNGC would require a special reamer