Just get a TC Renegade stock and buy a green mt Long range Hunter barrel in a .54 cal. You get to use a sidelock but have the barrel with a sabot twist of 1:24. Then you can shoot a .452 bullet to a .500 dia bullet. That would be my choice. Which is why I exactly did just that. You can order the sabots of MMP. Which is seems thats what you have to do anyways.