Mario that's one sweet looking rig. By the sounds of it I wouldn't worry about breaking it in, it seems to be shooting good already. Unless you're shooting against Boots Obermeyer I think that too many people put too much emphasis on breaking in a barrel. As far as using the Mueller, I wish more hni members would give them a try. They're the best kept secret out there. This one looks even better than the APV that I have on my 17hmr. The reticle is pretty unique looking and I like the 1/8" adjustments. For those that are interested here's the link to the scope you bought.

http://www.muelleroptics.com/products/MU41650IGR.html