I've had trouble with a problem for awhile now on my 300 blackout and think I may have my problem figured out, but don't know how to fix it. I've been using powder coated boolits. The other day I wanted to do some function tests and found that my boolit was being scrapped by the edge before the throat (in the chamber). I believe this edge needs to be rounded or tapered in order to reduce the chance of the edge scraping the lead or powder coat before firing. Is there any way to smooth this edge out without affecting other parts of the chamber?