Interesting, Brian Pearce's articles never seem to identify the test data source or testing method.After reading the article about the 45 colt I'm wondering where the 20,000psi information was developed at. I've searched all over for info on the "New Vaquero" and have found NOTHING to collaborate this information. Quite the contrary, everything I've read, from John Taffin and others say to stay within SAMMI limits, thats a little over 15,000psi. I doubt that 20,000psi is going to blow it up but those limits are there for a reason. If you have further information on this please post I'd be very interested. But from more than one RELIABLE source..