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Hi Pommy, not sure to be truthful. I did try coating a shell in marker pen but did not find anything definitive.
I had assumed that my brass was oversize in the body and to size that down I had to...

I have had similar problems with a 243 lever action. Also use the wilson's gauges.
Ended up screwing the die down to ensure that it bottoms out against the shell holder.
Have to full length resize...