Daryl,
thanks for that. I will definitely try that method when the expander comes back from coating.
I use the Redding competition shell holders as they come in 0.002' increments and allow you to accurately adjust for headspace. Unfortunately with the older Bertram brass, which this is, Bruce did not anneal between each stage when forming the brass from a slug. He only annealed at the final stage and consequently the brass had been work hardened beyond the point where it could be softened successfully and consequently much of his earlier product would split necks even after only one or two re-loads. He now anneals between every stage and this problem seems to have gone. The brass I have is the older stock so hopefully I don't have problems.

Vlad,
I have some on order already but thank you anyway for your advice.

Waidmannsheil.