I completely ignored all break in with both of my Proof barrels. In fact, I’m at 300 rounds with my latest one, and I’ve never cleaned it since before I shot it the first time. No problems with either. It is literally impossible to mess up your Proof, or any barrel for that matter, by not doing break in. The only logical reason to do break in, in my opinion, is to increase the chances that your barrel cleans easily. For what it’s worth, my Proof cleans as fast and easily as any other barrel I’ve ever owned, whether I did break in on them or not, and I haven’t seen anything from my new one to make me think it will be any different.