Yes you can make 7x57 from .270, fireforming loads not necessary if you don't want to.
I've formed 6mm Rem, 7x57, 8x60, 7x60 from from .30-06 & .270 (and .35 Whelen just to see if I could)
Sometimes you can form in one pass without intermediate steps if you're careful, and have just the right amount of sizing wax.
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