Is it a standard or magnum bolt face? If standard, I would choose the 25 caliber and the 25-06 cartridge. If magnum, I would choose the 6.5 caliber and the 6.5 PRC cartridge.

However, if you’ve always wanted a 35 Whelen, then definitely go that route.

On second thought, only do the Whelen cartridge. Most all other cartridges can be had in factory offerings for much cheaper than a custom job.