Leeman,

Don't get me wrong re Widden, just never used them. I believe they will make a set of dies to match your chamber, send them 5 fired cases.

It does look like returning your dies and some brass to the manufactures is the only option or......

....If you are looking for the ultimate die then the Warner is 'it' , I had one that came with my 6mm Swiss Match from Warner as they built the rifle. It is a work of engineering art and can be adjusted to do exactly what you want of a die, but serious £££ https://www.warner-tool.com/reloading-dies/ you also need a 1 1/2" threaded press e.g. Rockchucker with the reducing bush taken out.

T