There is no Model 33 Winchester rifle. Would you recheck the model number and I will do what I can for you.
Sorry, I was looking for a Model 33, not 33 caliber. I have found 2 place that make custom ammunition and make the 33 WCF.
MidwayUSA has new brass for loading your own ammo. http://www.midwayusa.com/viewProduct/default.aspx?productNumber=541144
There are some places that have dies to re-form brass to load your own. It is a lot of work, but can be worth it. It can save a ton of money if you have a reloading press.
Midway also has the dies for reloading. http://www.midwayusa.com/viewProduct/default.aspx?productNumber=465814