Again, congrats on the new SBE II purchase. As for "breaking it in", I would just recommend shooting several rounds of 2 3/4" target loads through it just so you can see how it performs and handles. I've had my Vinci for over a month now but I've only shot about 200 rounds of target loads through it, which is basically what I consider breaking it in. If you don't intend shooting 3.5" shells, I don't think it's really necessary to put them through your gun. Again, I would just shoot a few target loads, maybe a day of skeet shooting or something, and then bump up to some of the 3" loads you plan to use for turkey hunting. Hope this helps!