I have some .503 Bull Shop 460's that are just a bit loose in the 2 guns I shoot them in, i.e. they can be shaken off the powder in a clean barrel but not a fouled barrel. My next order will be for the .504's which stay put as they should. I got to thinking about knurling them on the front driving band to see if I could swell them up by .001 so they would stay put. I thought I would ask if anyone has ever tried doing that to a conical. If so, how did it work and what is the easiest way to do that? Thanks in advance for any replies.

BTW, I have tried wrapping them with teflon tape but didn't get as good of accuracy that way.