Bill Calfee (pronounced 'caffee') is a controversial figure. But IMO his book is well worth at least the $11.00 Kindle read (I actually own paper copies, because I'm weird like that) and he spends more time with the leade than anyone under the sun. He used to come on this forum until the Nice Folks drove him back under his rock....
I misdoubt you'll find many folks here who agree with his "hobbing" method of removing burrs but you have to ask y'erself "why?" as they don't seem to offer an alternative.
Maybe the RF forum is different.
For myself, I've "hobb'd", used a lap, used a bronze brush, used a bronze brush wrapped in 0000 and, lastly, just learned to hand-cut my throats and avoid them on CENTERFIRE rifles.
I know absolutely diddle about rimfire.