Very nice pair Ken.
I checked first to see that it wasn't a Delta L problem
Being that isn't the case, a very simple approach might be to grind a few thou off a case holder. Cheaper than new dies and would solve the problem of a short chamber.
Blueprint the fired case and see how the dimensions align with the standard 7x57.
Afterward try and resize the fired case a little at a time and see where the die hits it. At least you will know where the issue is.

Cheers,

Tom

Carbonation without fermentation is tyranny