I have been searching high and low for Remington .3 Whelen brass, but have found none. Does anyone know of a source?

Use another brand; readily available. Remington does not make brass unless it will sell a million pieces. I have talked to the factory and corporate HQ about that.

Midway has some in stock.

Rem 35 brass did not work in my Whelen. I simply took Win 06 brass and ran it into the Whelen dye. Worked fine.

the wheelen is just a 30;06 necked up - others are the 400 wheelen 338/06 280 270 6.5/06 25/06 6mm/06 etc all are made by just passing a 30;06case through a sizer (or 2)

Norma has 35 Whelen brass.

I have a batch of 50 new unfired unprimed R-P .35 Whelen brass if you would like them. PM me if you are interested.