You need a Lee style push through sizer for that. Fill the lube grooves first and they'll size down nice and easy without collapsing the grooves. You'd be amazed how much you can size a bullet if you have a properly shaped die with a good finish on it. I shoot the Lyman .446" bullets in my Vetterli, and size them to .433" in one pass with no problem. (very soft lead of course) and it's funny to watch, they get nearly 1/8" longer, but otherwise no damage.