I’m looking to expand the necks on some new lapua brass in 6.5CM so I can run them thru my .291 bushing to get the correct tension. I’m confused on exactly what I need . I was looking at the mandrels but from what I understand, those are just to manipulate the neck tension from the inside. I talked to Pat Regine at PMA and he can make me a custom mandrel but will take a few weeks and I need something a little sooner than that. Any suggestion?