I would't resize the finished round. You'd be crushing the bullet and would likely ruin accuracy.
My 10mm rounds all look as the OP describes and I've never had a functional issue with any of them.
Still happily answering to the call-sign Peetza.
You do not HAVE a soul. You ARE a soul. You HAVE a body.
He is no fool who gives what he can not keep to gain what he can not lose.
-Jim Eliott, paraphrasing Philip Henry.