I would buy some 1 fired 06 and then only need to expand from 30 to 35.
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^^^ What he said ^^^
When you stretch a .270 dia. cylinder to .358, you will reduce the wall thickness by a factor of 0.75. So, necks that are .014" thick will become 0.011".
Stretching an '06 case will result in a factor of 0.86, yielding 0.012" necks.
