300 or 338 Dakota but you will need to set shoulder back OR
404 Jeff OR
There is an outfit that will make some for around $7 each with minimum order of 50 ($350 total). Search custom rifle brass. RCC Brass or something similar.
This is the correct answer. The rim on Dakota and 404J brass is nominally the same.
RCC has a very long lead time in my experience. Check the diagram they send you very carefully - that is what they set the mill to, and if it's wrong the brass is useless.
