You can also check to see whether the shoulder is to far back by feeding a case into the chamber and closing the bolt. If the shoulder is back to far then the extractor will not jump over the rim when you close the bolt.

I have a set of CH4D dies for my 9.5x57 and it contains an expander to open the case up to parallel, however as it opens up the case significantly in one hit it takes a lot of effort to move the ram which means that you are placing a lot of vertical load on the case. It would be better to make up an additional expander to open the case up half way first. It's also a good idea to get the expander button coated with one of the super hard low coefficient of friction coatings that they use on cutting tools. I use the Zenit coating from Guehring but in the US they have some additional coatings with an even lower coefficient of friction.

I am making one for my die set so am happy to make one up for you as well.

Or anybody else who wants one.

Matt.