Thanks, Shep. This will likely be a slowly developing thread, but I'll try to keep up on it. The smith who built the rifle did mention that, after the barrelis shot out, there was no reason to use the tight necked chamber. The adage "thin to win" seems to no longer be the "thing". Super tight tolerances winning or losing aside, I'm happily miserable learning and ( hopefully, lol!) executing the process of loading for a tight chamber. I've spent 15 years just running off the shelf dies and SAAMI chambers ( doing fairly well), the last 5 years actually delving into what really works, custom chambers, precision measurements and all the other stuff that never really matters when you practice at 1000+ and harvest game at 100, lol! It's fun and frustrating at the same time. If all this extra stuff doesn't pay off, I'llbe ****ed! The rifle is a proven shooter, I'm just hoping to do it justice and develop some skills along the way. Thanks for the guidance fellas.