My new Sendero arrived yesterday. At first glance I was not impressed at the quality versus the cost. The SS was rough and I had to get a rust like stain off the barrel. The inside of the barrel was just as dirty. So after a good cleaning in and out, a trigger job (3-4.5lbs from the factory but crisp) I loaded up my sight in rounds. 100gr. Sierra Game Kings over IMR 4350 with a velocity of around 3000 FPS. I did not Chrony them. Bore sighting and then shooting two at 50yards., then five at 100 yards. I put four in a group of .579". I did have one flyer I did not count but it was .75" away from the four shot group. No I did not break in the barrel. I may be sorry but we'll see.