I did.
Filed a flat spot, marked the welds with a punch.
Used a small drill bit to start, slowly stepped up the size.
Took about an hour because I was using a hand held drill not a press.
Use some kind of barrel vise, take the barrel off.
I went with the PWS triad. I quite often post that I'm a BIG fan of it, so much that I'm looking for a bigger version for my 6.8.