.375 Chey Tac Brass Preparation

[LMK]

I am working on neck turning a batch of .375 Chey Tac brass and have an issue I could use some input on.

After some experimenting it was necessary to anneal the neck and shoulder of a couple cases to make the neck turning process possible. The brass was too hard to for the standard expander/turning mandrels to function with the amount of springback on the brass.

I see a lot of factory brass annealed in the same area but would like someone with experience in this cartridge to give me their opinion on the matter. I intend to fire form the shoulder so it seems annealing would help in that process and I presume the area will work harden after a few reloadings in any case.

I appreciate any assitance that can be given. Thanks