SR James...Do yourself a favor and call Joe Woods and order his tool. Takes a little time but it's easy and flawless. What I see in your pic I would not consider a "cone". As others have mentioned mine go down at least 1.5 inches. I cone mine a little more than Joe recommends in his instructions. I stop when I can push a PRB below the muzzle with just a little pressure from my finger. You have plenty of meat there to use Joe's tool and cut a proper cone.