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I've read with interest about a lot of folks on the boards, fire forming 30-30 brass into .375 or 38-55, I have a 38-55 and made a new expander for my lee dies and what I did was to make one out of bronze that is shaped like a long bullet, tapering up to a flat .375 the length of the case mouth to the start of the shoulder, I generally lose about 5 of 100 due to splits now mind you I do this before they are deprimed as don't want any extra work for that 5 of 100, just a spray of Hornady One shot and I upsize in one stroke. Take care and have fun. Swany