Break in is very debatable as you can see there are those on both sides of the fence, however I would agree statjunk in that how better way to learn about your new firearm than to take it apart an clean it a whole bunch of times. One thing to note, just like a car, a real dirty barrel is much harder to clean than a slightly dirty one.

Start with the cheapest ammo you can buy, no need burning up the premium stuff. I shot three boxes through my new gun before I could start to see its tendencies. The biggest thing I found is that a hot barrel makes more of a difference than a dirty barrel in my experience.