Thread: necking up 243 to 7mm08

Is there any tricks to caseforming 7mm08 out of winchester 243 brass

I have a ton of it and need some 7mm08 cases for a new barrel thats on the way, I stopped in to my local gunshop and he told me its been out of stock and on back order for 18months

so plan B is to do a bit of case forming of maybe 40 rounds but I had a primer blow out and a face full of gas and a hell of a fright resizing 270win to 280rem
so I thought id ask here first this time