Just saw this thread, Im surprised that no enterprising individual has set up a "voluntary" proof house in the USA, charge $30 or something and put a load through the weapon that is 30% higher than reccomended. If it passes send it back to the owner with a certificate stating the load that has been fired BUT no guarantee implicit (I know you lot have a lot of lawyers) ! At least this would provide some comfort to chaps who want to keep using their "old" stuff without having to send it to the UK, just a thought, best