Hi Dumprat,
I still think your loading problem is a gunsmithing one rather than a cartridge shape one. Calibres larger than 35 have been successfully built on mauser actions and 3006 or 8mm rounds. Another option would be to go to 35 Whelan Ackley Improved. This will sharpen the shoulder up and still give you the option of using factory 35 Whelan ammo if neccessary.
Regards
LesLeeSpeed