I agree with what Savage said. If you keep things cool, I don't think the barrel knows if you are shooting one, cleaning or shooting five, cleaning. I have read post by smiths that said, after the rifle is chambered and crowned, you cannot hand lap the barrel without belling it at one end or the other or both. So firing it smooth is the only choice. FYI, when breaking-in new rifles, I use a little JB paste along with my cleaning.
As far as fire lapping goes, I have read some post that claim spectacular results but the idea of shooting a sandpaper coated bullet thru my bore gives me the willies.
Shooting at a disciplined rate, not only during break-in but thru out the life of your barrel, will go a long ways toward increasing the life expectancy of your barrel.