Yea, it works but only on some barrels. If you have a crap remington barrel thats rougher than a cobb, nothing is going to break that barrel in. If you have a new good barrel that just has some minor machine marks, you can see a difference. Same thing as using a hawkeye bore scope and finding the rough spots and lapping them out.

But this recipie of shoot once and clean, and on and on is stupid. If you shoot and clean, and do this over a few times and get no fouling, then move to 3 shots and clean, and do that a few times until no fouling, then things are getting smoothed out. You need to let the gun tell you what is happening. I would be most guns however are just rough.