After reading Marshall's technical guide as well as his articles on the .444 Marlin, I'm convinced fire lapping is the best way to achieve the accuracy we all strive for. My question to Marshall or any other member of this forum is this. Would jacketed bullets be more accurate than cast bullets when shot from a barrel which has not been lapped? The lapping process sounds fairly straight forward although time consuming. It's the slugging of the barrel that worries me. I sure would hate to louse up a new outfitter. Thanks for your help.