I thought I already posted on this topic. My experience has been very good. You need to read the web page and talk to their experienced techies.......Hey, this is the word champion we are talking about! I have used the system and they work up to 45% on groups. http://www.davidtubb.com/finalfinish.html

All I can say is that this firelapping system has worked on three of my rifles.....one old and 2 new. Good luck and regards, Rick.