Never woulda thunk it! Let play doh dry hard, or is that why you have it in a ziplock?Virgin Lapua 6BR cases right from the box ready to f-form to 30BR in the 1.520 length chamber. Winchester 231 powder, toilet paper and Play Doh. I like the blue Play Doh best. But I'll use whatever color that's on hand.
The result is perfectly round/straight case necks. The part of the shoulder that becomes the outer 'lump' when expanded manually isn't there. It's on the inside now and is thinner and longer than when it was on the outside. I remove it before outside turning.
Good shootin'-Al
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