I have a De Haas barrel on a custom built Hawken that was built by Dale Storey. Frank De Haas is well known for his books on single shot rifles and is a gunsmith of some repute. His son Mark still makes barrels---very expensive. My barrel is made to shoot conicals and does so so very well. It is finished like a miror inside. Ed Rayl is another barrel maker with a great reputation for quality barrels. I called him for help getting a ML to shoot conicals----he was very pleasnt and the advice he gave me has helped get a number of guns to shoot well. He would be at the top of my list for a good ML barrel.