Thanks Drew for posting these pics. As the old saying goes one picture is worth a Thousand words. Your pics so graphically illustrate what I was trying my best to say. If only the cone is lengthened (Not the chamber) in a quality manner it will be an extremely rare occasion where strength will be compromised. As to whether its good value for the costs incurred is for each to decide for themselves, personally I think not in most cases.

Miller/TN
I Didn't Say Everything I Said, Yogi Berra