Good points, I didn't mean to start anything. I understand what you're saying. Manufacturers, proof houses, and Bubba all have their own standards for movement in the chamber and elsewhere. You should just set yours and stick with it and once it proves it will handle that load drop that extra 30% and stick with that pressure load. And even then your not guarenteed anything.

As far as someone in the US selling one of these guns, I can't see that being a good idea. Maybe it would if you had a lawyer come up with a waive of liability that the client could sign and if that scared them away atleast you didn't leave yourself open.