.33 WCF is hardly a new cartridge. It was introduced shortly after the turn of the century (of the last century), as a smokeless medium bore round for the Winchester 1886 lever action. Factory ballistics were on the order of 2,000 fps for a 200 grain flat point slug, which made it quite powerful for the time.
I loaded for this round a long time ago. There were no factory jacketed bullets available, so I had to cast my own. I believe the powder was 3031; I have no recollection of the charge. Apart from the curved steel butt plate, the rifle was a joy to shoot.
Edit:
I've looked it up in Pet Loads; Ken Waters' load was 35.0 gr. 3031 for a 200-gr. cast flat nose.