As per Walt, the 225Win brass is quite strong making almost any wildcat based on it doable with long brass life if you dot your "I's" and cross your "T's" with loads (the 225Win wildcats can be pushed too hard for the Contender frame and the brass). While I loved the 6.5JDJ's I've had, for my uses the 257JDJ's out shinned them and were my favorite 225Win based JDJ's. Still have 500 new 225Win brass for a 30 Merrill that never happened before I sold all of my Contenders. I think it would have been a favorite too, and over the 309JDJ's and maybe even over the 30 Alaskan Bower's I had. Even so all my 375JDJ's were my "go to" JDJ's for shear fun in shooting along with all the 17 Ackley Hornets. I owned a h*ll of a lot of barrels over the years, chambered for a h*ll of a lot of different catridges... commercial, long defunct commercial and wildcats. Each had its good and bad points, all had a use, but the 375's and 17AH's were the easy favorites for me anyway.