R,

This really explains why one source for your reloads is really never enough. IT can be enough to build safe loads, but you might find you are leaving some velocity on the table. And as you noted, you really need to study and understand what they are using for a test vehicle. And especially if they are actually pressure tested. I know Hodgdon's is great about always giving pressure.

I can tell you without hesitation that a test barrel mounted in a fixture is about a million miles away from your actual firearm where you will have handful of variables like unsupported throat, magazine feeding and all the variables of your gun fitment that have to be factored in. You have pressure that is safe for the brass. Pressure that is safe for the brass in your gun. And pressure that will not beat your gun into a pile of parts. These may or may not coincide ;^)

Craig