Not to upset the cart either...

Is the 6.5Gibbs the same case? Here is a link to a company making that brass, though I see it is a limited run and needs sufficient backorders for them to make it.

http://www.qual-cart.com/

Actually, upon looking at their catalog, they offer the above mentioned and the 6.5x53R later along with the 6.5x54 M/S. Not cheap, by any means, but would have the correct headstamp.