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Greetings Micky and dannyb,
I almost suggested this but there may be a fly in the ointment. The resized cases will be around .007" or 0.18mm larger in neck dia than a .270WSM case. The chamber is...

Greetings dannyb,
If the .270 WSM brass has just been necked up to 7mm and has not been fired then there should be no problem in necking it back down. You should check if the shoulder has been moved...