So long as it hasn't been fired too many times, or work-hardened, it should be fine. You'll probably even end up with a case length that's only a hair too long (if at all).
If it's R-P .35 Whelen brass, it's drawn as .280 Rem, until the final forming step. So, what you've got is .270 Win / .280 Rem, that gets expanded to .35 caliber (and has a thin neck at .35 caliber).
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Don't even try it. It's even worse than the internet would lead you to believe.
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