Once fired 338LM brass to 338Norma

Just Macca

Mealteam 6
Full Member
Minuteman
May 13, 2013
560
360
Australia
Hello all, I have a few questions.
I have some once fired RWS 338 Lapua magnum brass that I got for free. I've cleaned it up and it looks excellent. My questions are:
1. It was fired in a Blaser LR2. Is it possible it has a "military spec" chamber that's a little oversized for reliability? If so, will full length resizing put it back to spec? Or is there a special die that goes right down to the case web?
2. Is RWS 338LM brass of decent enough quality to bother?
3. Finally and hardest to answer. Is it possible to form 338 Norma mag brass out of 338LM? Would I need a Hydroforming die or something similar? Cream of Wheat? Or just not possible.
Thankyou.