As I recall, Sherman Bells comments about pressure versus chamber length mention the inconsequential differences as Wonko says. I'm still waiting for the Bell quote that says anything contrary. Very few quality makers have gone to longer cones, again contrary to what some posters state. Long cones are absolutely risky in repeating shotguns considering the prevalence of separated hulls today. They can also be risky in break open guns used by those who don't check their bores every shot before loading another shell.