I believe this page has what you are after. http://www.davidtubb.com/final-finish-tms I don't know if he invented the process but he seems to have commercialized it.
You would just need to buy a suitable 6.5mm bullet based package and load it into some of your brass. Some people say the coarsest grits are not needed, and instead of getting a "final Finish kit" they get a TMS (throat maintenance system) kit instead. Supposedly the TMS kit has enough components to lap 2 barrels and skips the most aggressive abrasive.
I have not done it, but it does of course produce some wear in the throat, but for those of us shooting high BC bullets a slightly longer throat may not be such a problem. Where this can be a problem is when one has a rifle that you wish to shoot a wide range of bullets out of including shorter ones. In that case the throat wear might negatively affect the light bullets.
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