I agree with the break-in using heavy field loads. Unfortunately the trap range wouldn't let me use them. I think the gun is so tight out of the box that the action has to be worked in. Heavy loads help do it quicker with fewer problems out of the box. I plan to do a heavy load break-in on my next field outing along with some pattern testing. Even so, I still had no hang ups on my first 125 shots.
When I took delivery of my SBEII the box had never been opened so the gun had not ever been assembled (except at the factory I'm sure). The tolerances were extremely tight. I had a little trouble assembling it the first time. Specifically the bolt handle required a gentle pry to get it out and the Fore-end stock was very hard to slide over the magazine tube. I'm not complaining a bit, I would rather see a superb tight fit than a sloppy fit.