I have used a wooden dowel slightly smaller than .22 and glue 320 or finer grit wet-dry around it. Then I hand turn it in each cylinder to the length of a shell case. Only a minute or so on each cylinder. Then I polish with a small cleaning patch with Mothers Mag polish (once again, I just hand turn it). I will then go to the range and assess. Repeat as necessary. It works and with my minimalist approach I have no fear of over-doing it.