Stuart

Manson Reamers will make what you want.

http://www.mansonreamers.com/PriceList.htm

From their website for Wilcats/Specials

Wildcats/Specials

Shipped in wooden boxes

Solid Pilot - $165.00

Removeable Pilot - $195.00

Extra large reamers and gages to quote

You only really need a removable pilot if you are going to do different calibres on the same case or if you have a barrel with that is odd. For example a 300 RUM reamed with removable pilot would also allow a 375 RUM to be done as long as the gunsmith had a neck and throater for 375.

Huntingtons list the 333 Flanged under Special dies and it is Group G. However, if you are going to do it with as a 338/333 then it might be easier to start with CH rather than having a RCBS die softened, enlarged and rehardened.

I don't have a Cartidges of the World handy but I think you will find that the 333 Flanged is about like a 404 Jeffery shortened a bit, necked down to 333 and a rim added.