I have a Contender barrel chambered for the 375 Winchester round. Brass for this round is scarce, and when found, expensive. I have over 1000 empty 30-30 cases. i would like to reform some of these to 375. How many neck expansion steps should I make to achieve this goal? Do I anneal before or after reforming? I have expander buttons for .312, .338, and .357. Will that be enough? I realize the 30-30 brass is thinner than 375 brass, but my loads for the 375 are not excessive, so I don't think there should be a problem. Your thoughts?