I'm pretty sure most, if not all, Peterson pipes come pre-carbonized and don't really require breaking in, but they do suggest, even on the official site, that you smoke only half a bowl for the first 5-6 smokes in a new pipe. I break them in like their website says. Some people though just load it up completely and slowly smoke it to give the bowl an even break in. I'd definitely suggest though, if you're doing that, to use a blend that always smokes to the bottom every time for you. If I did that I'd use Peterson's Sherlock Holmes blend, because for me it burns evenly and to the bottom every time.