Wax up the nose of a bullet, scuff up the seating stem seating face and clean it well. Get yourself some steel stick (epoxy putty that you knead together and it sets up hard) Put a little of the kneaded putty on the tip of the stem and try to lightly seat a bullet, then carefully pull the stem out and trim the excess material off it. You will have to work reasonably fast as the steelstik only has about 8-10mim of open time.
You end up with a stem that matches the projectile you are using perfectly. I have done a few like this and have done the same thing for stems to seat gaschecks so you don't deform the nose.
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